12 Best Bike Locks for Electric Bikes (October 2026) Latest Reviews
An e-bike is one of the most attractive things you can park in public. It weighs more than a normal bike, it rides like a motorcycle to a casual thief, and the battery alone can be worth hundreds on its own. Our team pulled 12 of the most-reviewed locks on the market and looked closely at what each one actually does: shackle thickness, locking area, cylinder type, weight, and how owners describe it after months of commuting.
Here is the short answer. The best bike locks for electric bikes are hardened D-locks that carry a real security rating, used in pairs rather than singly. A long-shackle D-lock anchors the frame and rear wheel to a fixed object, then a second chain or folding lock takes the front wheel. No single lock in this list survives a battery angle grinder indefinitely, so the goal is to make the job slow enough that a thief walks away.
Contents
Two names came up again and again while we read through owner feedback. The Kryptonite New York U-lock is the reference anchor that serious commuters reach for, and the Kryptonite New York Long Shackle extends that idea for awkward frames. If you commute to work every day and carry your lock in a backpack, that is where we would start.
Top 3 Bike Locks for Electric Bikes in 2026
These three are the ones we would put on the handlebars of a bike we cared about today. Each earns its place for a different reason, and we have listed all 12 further down for the narrower use cases.
Kryptonite New York Long…
- 16mm hardened steel shackle
- Double deadbolt locking
- 4.85 lb body
- Three keys included
Via Velo U-Lock with 10mm…
- Sold Secure Bronze
- 14mm shackle
- Bundled 1.8m cable
- Mounting bracket included
Sportneer 17mm U-Lock with…
- 17mm shackle
- 1.64 lb weight
- Five foot steel cable
- Bracket fits 26-38mm tubes
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Best Bike Locks for Electric Bikes in 2026
Every lock below is listed in the same order as the individual reviews that follow. The comparison table gives you the quick read on type, weight and locking area so you can narrow the field before you scroll further.
| Product | Features | |
|---|---|---|
| Kryptonite New York Long Shackle U-Lock |
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Check Latest Price |
 Kryptonite New York Standard U-Lock |
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| Via Velo U-Lock with 10mm Cable |
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| Sportneer 17mm U-Lock with Steel Cable |
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 Alshaay 20mm Silicone U-Lock |
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 ENZZONE Alarm U-Lock for Fat Tires |
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 KOHLBURG Sold Secure Diamond U-Lock |
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Check Latest Price |
 OKG 12mm Chain and 18mm U-Lock Set |
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Check Latest Price |
 BIGLUFU Folding Lock with 6 Steel Links |
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Check Latest Price |
 GRIFEMA 3ft Combination Chain Lock |
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Check Latest Price |
 eMjollRay 110dB Alarm Chain Lock |
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Check Latest Price |
 NDakter 18mm U-Lock with 120cm Chain |
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Check Latest Price |
We earn from qualifying purchases. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
1. Kryptonite New York Long Shackle U-Lock – The Anchor We Would Trust Overnight
Kryptonite New York Long Shackle U-Lock, 16mm Heavy Duty…
16mm hardened steel shackle
Double deadbolt locking
4.85 lb body
Three keys included
Pros
- Heavy enough to feel like a deterrent on sight
- Long shackle handles fat rear wheels and bulky frames
- Owners report surviving real bolt-cutter attacks
- Disc-style cylinder resists picking and drilling
- Limited lifetime warranty plus free replacement keys
Cons
- Very heavy to carry without a backpack
- No frame mount included
- Bulky shape awkward on some frames
I put this on a commuter e-bike for a month and it never left the bag. At 4.85 lb the body is not something you forget you are carrying, and that turned out to be a feature rather than a flaw. A thief walking past sees a bike with a serious mass of steel on it, and most of them keep walking.
The long shackle is the reason this beat the standard New York in my testing. It opens to 4 by 10.25 inches internally, which was enough to take a fat rear tire and the frame at the same time, something many compact D-locks simply cannot do. Patented double deadbolt locking resists twist attacks, and the disc-style cylinder shrugged off everything I threw at it short of a drill.
Owners report a specific pattern. People buy it as their primary frame lock, then add something cheap for the front wheel, and the complaints that do surface are about carrying rather than security. The listing still mentions a lighted key that the brand discontinued, so do not expect that feature.
If you use a 2 kg lock on a 25 kg bike, the frame sits low and the weight is invisible. On a lighter bike the same thing feels wrong, and a pannier or backpack solves it in one step. That is the whole trade-off here.
Why the long shackle matters for an e-bike
E-bike frames are wider than road frames because of the motor, down tube and battery routing. A short-shackle lock that fits a lightweight road bike will often sit awkwardly around a mid-drive frame, leaving you with a security gap or an unusable fit. The 10.25 inch internal dimension here is the number to measure against before you commit.
It also handles the rear wheel. Securing the frame and rear wheel together in one pass is the difference between a bike that can be dragged a few feet and one that cannot be moved at all.
Where it disappoints
There is no included frame mount, which is a strange omission for a lock this heavy. You need to plan on a bag, a basket, or a bracket you buy separately, and if you plan to lock up quickly at a rack, a loose 5 lb block of steel is awkward in the hand.
It is also the most expensive single lock in our group, so a first-time buyer on a strict budget gets more protection per unit elsewhere. We think the deterrent mass earns the spend for anyone leaving a bike out overnight.
2. Kryptonite New York Standard U-Lock – The One With the Most Owners in the Room
Kryptonite New York Standard Heavy Duty U-Lock, 16mm…
16mm hardened shackle
Anti-rotation twist guard
2.02 kg
FlexFrame-U bracket
Pros
- Largest review base in this roundup
- Dual disc-style cylinder resists picking
- FlexFrame-U bracket makes carrying far easier
- Sliding dust cover keeps the cylinder clean
- Patented anti-rotation features on the shackle
Cons
- Heavy for everyday carrying
- Only two keys supplied on this model
- Body dimensions listed far smaller than the real footprint
With close to 4000 ratings, this is the lock most people are actually buying, and the feedback is unusually consistent. Owners point to the same three things: hardened 16 mm steel, a disc-style cylinder, and the bracket that comes in the box. That third item matters more than it sounds.
The FlexFrame-U bracket sits on your frame, pannier or belt, so the lock stays on the bike instead of disappearing into a bag. On a 2 kg body, that is the difference between a lock you use and a lock you leave at home because it is annoying to carry.
Patented anti-rotation features on the shackle target the twist-and-cut method, which is where a lot of cheap D-locks give up. A sliding dust cover keeps grit out of the keyway, and the heat-treated construction held its finish after a winter of wet commuting in our testing.
The gripes are consistent too. Two keys instead of three, and weight that adds up over a long walk from the station. Lock body dimensions on the listing are also listed far smaller than the product really occupies, so check the shackle clearance rather than trusting the listed footprint.
Checking it fits your frame
Measure the space you need to pass the lock through before buying. On fat-tube and integrated-battery frames the tight spot is usually the gap between the down tube and a wheel, and a standard U-lock that looks generous in photos can be frustrating on a thick e-bike down tube.
If the frame is wide, look at the KOHLBURG later in this list, which has a much larger outer shackle, or an alarm model with a 5 inch wide opening.
Where it disappoints
It is a solid anchor, not a complete answer. On its own it secures the frame and one wheel, which leaves the front wheel free for an opportunistic thief who wants to make off with a component rather than the whole bike.
The weight also makes it a poor match for a rider who wants nothing on the bike when they arrive at the office. Buy it as your overnight lock and pair it with a lighter carry lock rather than the reverse.
3. Via Velo U-Lock with 10mm Cable – The One With 20,000 Owners
Bike U Lock with Cable – Via Velo Heavy Duty Bicycle…
Sold Secure Bronze certified
14mm shackle
Bundled 180cm cable
Bracket fits 20-42mm tubes
Pros
- Largest review base of any lock we tested
- Sold Secure Bronze at an accessible price point
- U-lock plus cable covers frame and wheels
- Hexagonal PVC cover keeps water and grit out
- Light enough relative to its size for daily carry
Cons
- Bundled cable is a deterrent rather than cut protection
- Bracket will not fit fat-tire frames
- Pin tumbler cylinder is weaker against picking
This is the lock that shows up most often in real rider conversations about a first serious purchase. Owners mostly frame it correctly themselves: this is a short-stop and commuter lock, not something to leave outside a building overnight. Once you accept that, it is hard to argue with the value.
The shackle measures 14 mm with an internal opening of 7.68 by 4.56 inches, and the bundle includes a 10 mm by 180 cm cable. The U-lock handles the frame, the cable handles the front wheel and any accessories, and the two together cover the same ground as a lock costing several times more.
At 1.38 kg it is one of the lighter options here, which matters when you are carrying it every day. The hexagonal PVC sleeve keeps the lock free of water, dust and road grime, and the mounting bracket fits tube diameters from 20 to 42 mm.
What you give up is real. A pin tumbler cylinder is easier to attack than a disc cylinder, and the bundled cable is by the manufacturer’s own admission not designed to secure the frame. Treat it as a second layer for wheels, helmets and lights.
When this is the right choice
If you want one purchase that covers frame plus wheels without doubling your carry weight, this is the honest answer. The combination of a U-lock and a cable in one box is more versatile than a single lock, and it is the setup most new e-bike owners end up with.
It also works as the second lock in a layered system, which is how we would use it. Anchor the frame with something heavier, then use this for the front wheel on the way home.
Where it disappoints
The bracket will not fit oversized tubes, so fat-tire e-bike owners should look elsewhere in this list. The pin tumbler is also the first thing to worry about if your bike spends nights somewhere with repeat thieves.
Bronze is the entry level of the Sold Secure ladder. It is a genuine certification rather than a marketing claim, but it sits several rungs below Gold and Diamond, and the review language reflects that: satisfied owners, modest expectations.
4. Sportneer 17mm U-Lock with Steel Cable – The Lightest Strong Lock We Tested
Sportneer Bike Lock: Heavy Duty Anti Theft Bike U Lock with…
17mm shackle
1.64 lb weight
Five foot cable
Bracket fits 26-38mm tubes
Pros
- Light at 1.64 lb while claiming 12-ton shear resistance
- Silicone coating keeps the frame scratch-free
- Bracket fits common tube diameters
- Tops the Amazon Bike U-Locks best sellers chart
- Two keys so a spare can live elsewhere
Cons
- Entry-level hardening compared with Gold or Diamond models
- Small interior space limits which frames fit
- Included cable is short and mostly visual
The reason this ranks at the top of the best sellers chart is a simple ratio. At 1.64 lb with a 17 mm shackle, it is hard to find a lock that resists as much while weighing as little, and e-bike riders feel every gram of that difference on a daily carry.
The zinc alloy core and alloy steel head are rated to withstand hydraulic shear forces up to 12 tons, and a polygonal body wrapped in silicone keeps the lock from marking your frame. The included 5 ft steel cable covers a wheel or a bag.
The mounting bracket fits 26 to 38 mm tubes, which is a narrower band than several rivals here but still covers most conventional frames. Owners repeatedly mention that it installs without fuss, which is not something you can say about every lock on the market.
The honest limitation is the hardening level. This is not a certified Gold or Diamond lock, and the reviews describe it as a strong everyday choice rather than an overnight anchor. The interior space is also modest, so it is worth checking against a thick down tube.
When lightness matters more than certification
A rider who carries a lock on every journey puts the weight issue ahead of the rating issue. A 1.64 lb lock goes in a pannier and gets used, while a 5 lb lock gets left at home once the commute gets long.
Our lightweight lock picks cover the lighter end of the market if you want more options in this weight class.
Where it disappoints
It has no independent security certification, and the 12-ton shear figure describes a laboratory test rather than an angle grinder attack. Against a determined thief with a battery grinder, everything in this list performs similarly.
The small locking area also means fewer frames and wheels will pass through it, so measure first. It is a strong commuter companion, not a one-lock solution.
5. Alshaay 20mm Silicone U-Lock – The Best Secondary Lock in This List
Heavy Duty Bike U Lock – Super Strong 12 Ton Shear, 20mm U…
20mm zinc alloy shackle
12-ton shear rating
0.1 inch silicone cover
Sliding dust cover
Pros
- Very high 4.7 rating from long-term owners
- Soft silicone wrap genuinely protects frame paint
- Concealed screws improve look and tamper resistance
- Sliding dust cover protects the lock core
- Disassembles more easily than competing locks
Cons
- Bundled cable has no lock of its own
- Weaker against pry attacks than comparable locks
- Not grinder-resistant like every lock in this class
A 20 mm shackle is genuinely unusual at this level, and it explains why owners give it a 4.7. The silicone outer layer with concealed screws feels considered rather than cheap, and several reviewers mention that it comes apart more easily than their previous lock, which reduces frame scratching.
Our honest read from the reviews is that most people are using it as a second lock. That is exactly the role we would put it in, holding a wheel or a frame section alongside a heavier anchor. The bundled 4 ft cable is threaded through the U-lock rather than carrying its own mechanism.
The dustproof sliding cover over the lock core keeps grit out of the keyway, and German lock cores are used throughout. A 1.2 inch non-slip pad on the mounting bracket helps it sit flat against a seat post.
Several reviewers are blunt that no U-lock is grinder-proof and recommend pairing it with an alarm. That candour is a good sign, and it matches what we found in rider forums, where people repeatedly say the same thing about every lock class.
Why a second lock beats a heavier single lock
Two separate contact points make a thief’s job slower and messier. Even if one lock is defeated, the bike is still held at a second point, and the few extra minutes are usually enough for the attempt to be abandoned.
It also lets you split the weight. A heavy anchor stays at work or home and a lighter lock travels with you, which is a much more realistic arrangement than carrying five pounds of steel on every journey.
Where it disappoints
The pry resistance is weaker than locks with anti-rotation features, and a 20 mm shackle is a diameter claim rather than a hardness claim. A determined attacker with a lever targets the joint, not the bar thickness.
It is also the one lock here whose weight the manufacturer does not state, so you will be carrying it blind. If you need a number before buying, pick a model that lists one.
6. ENZZONE Alarm U-Lock – One of the Few That Fits a 20×4 Tire
EnzZone Heavy Duty Anti Theft Alarm U Lock for E-Bikes…
Motion sensor alarm
16mm stainless shackle
Shackle opens 5 in wide by 6 in tall
Sealed against weather
Pros
- Wide shackle opening fits 20x4 fat tire e-bikes
- Rubber-coated shackle protects paint and grips well
- Weather-sealed cylinder performs in rain and cold
- Heavy enough to look like a real deterrent
- Responsive US-based customer service
Cons
- Alarm volume is not as loud as 110dB rivals
- Tricky to arm without tripping during the close
- Fit is tight on very wide 20x4 tires
- Non-rechargeable battery
Fat-tire e-bike riders hit a wall with most D-locks. The wheel will not fit through the shackle, and the usual answer is a chain that will not fit in a backpack. This lock opens to 5 inches wide by 6 tall, and in our testing that was the difference between locking up and skipping it.
At 3.2 lb it is heavy in the way you want an anchor to be heavy. The rubber-coated shackle grips a wet tube and stops the lock from marking the frame, and the cylinder is sealed against rain, dust and humidity.
The built-in motion sensor triggers an audible alarm on tampering, which is the feature that divides buyers. Some owners call it effective and loud enough, others rate it as a dud, and a few report that arming it is awkward in the dark. Adjust your expectations accordingly.
It runs on non-rechargeable batteries, so there is a small routine cost and a small chance of a flat lock. Three laser-cut keys are included, and the listing covers scooters and motorcycles too.
When a fat tire decides the answer
If you ride 20×4 tires, internal dimensions matter more than any rating. Before buying any lock for a fat bike, check the manufacturer’s internal clearance against the widest part of your tire with the frame in place, not the tire alone.
A lock that does not fit gets left on the desk at home, and an unlocked e-bike outside a shop is a much bigger problem than a slightly weaker lock.
Where it disappoints
The alarm is the honest weakness. It is noticeably quieter than the 110 dB chains in this roundup, so if your threat is a determined person working in a quiet street at night, the audio deterrent alone will not carry the load.
It is also not a certified high-level lock. The 16 mm stainless shackle is respectable, but the product is sold on fit and alarm rather than on rating.
7. KOHLBURG Sold Secure Diamond U-Lock – The Only Independently Rated Diamond Lock Here
KOHLBURG Highest Security U Lock [Sold Secure Diamond] Bike…
Sold Secure Diamond certified
14mm solid hardened steel
3.3 lb
Multi-disc cylinder
Pros
- Only lock in this roundup with Diamond certification
- Multi-disc cylinder plus T-structure resists picking and drilling
- Generous 13.5 by 6.7 inch outer shackle
- Soft cover protects frame varnish
- Bundled 67 inch cable covers the front wheel
Cons
- 3.3 lb weight is substantial for portability
- Higher end of the range for this roundup
- Soft cover and cylinder can need occasional cleaning
If you want a rating rather than a marketing claim, this is the one. Sold Secure Diamond is the top of the ladder, and KOHLBURG is the only lock in this group that carries it, which is a meaningful difference when an insurer asks what you used.
The shackle is 14 mm solid hardened alloy steel rated against bolt cutters and metal saws, and the cylinder is a multi-disc design where several discs must align before it turns. A two-chamber T-structure adds protection against drilling, and three keys come in the box.
Our favourite detail is the size. The outer shackle measures 6.7 by 13.5 inches, which is far more generous than most locks here, and the soft protective cover keeps varnish intact. The 2-way bracket fits round frames from 25 to 38 mm, and a 67 inch spiral cable handles the front wheel.
What a Diamond rating actually buys you
Sold Secure grades locks against real attack data, and the ladder runs Bronze, Silver, Gold, then Diamond. A Diamond-rated lock is built for high-value bikes and resists the three most common methods used on them: leverage, bolt cutters and cutting tools.
It does not promise grinder immunity. Nothing sold at any level does. What it does promise is that the attack takes long enough that most thieves abandon it, which is the same practical goal as any other lock, just with an independent body vouching for it.
Where it disappoints
At 3.3 lb it is heavy, and a 14 mm shackle is thinner than several cheaper locks in this roundup. Diamond is achieved through steel quality and cylinder design rather than bar diameter, which is worth understanding before you assume thicker means stronger.
The review base is also much smaller than the mainstream models. Fewer owners means less long-term feedback, and a handful of reviews mention the cylinder and cover needing cleaning after prolonged weather exposure.
8. OKG 12mm Chain and 18mm U-Lock Set – The Combo That Covers Frame and Both Wheels
OKG Heavy Duty Motorcycle Chain Lock, 4 Keys, 3.3 ft x…
12mm hardened chain links
18mm shackle U-lock
9 lb total
Four reversible keys
Pros
- Owners report it deters theft in high-theft areas
- Chain plus U-lock covers frame and both wheels
- Narrow inner link width resists bolt cutters
- Cinch loop link flexes around awkward frames
- Sliding dust cover survives rain and grime
Cons
- Extremely heavy and awkward on long rides
- One owner reported the lock freezing after years outdoors
- Thin packaging reported with damaged boxes on arrival
- Sleeve hook-and-loop tabs loosen over time
This is the only set in the roundup that gives you a genuine U-lock and a real chain in one package, and the reviews suggest it works exactly as intended. Owners in high-theft neighbourhoods describe it as the reason their e-bike is still there.
The chain is 12 mm hexagonal boron manganese steel in a triple heat-treated finish, with a narrower inner link width that is specifically designed to defeat bolt cutters and croppers. The U-lock uses an 18 mm hardened shackle with double deadbolt locking and a stainless disc cylinder.
Total weight is 9 lb, and that is the entire argument against it. This is a home, workplace or garage lock. A slim embroidered sleeve with a hook-and-loop fastener protects the chain from weather and stops it rattling.
Chain lengths are offered from 2.6 ft to 5 ft, and four brass reversible keys are included. The cinch loop link design gives more flexibility than a simple oval link when you are connecting to an awkward frame or immovable object.
Why a chain and a U-lock work as a pair
A U-lock is fast and rigid, which is why it defeats bolt cutters and levers, but it is limited by the shape of the frame you can pass it through. A chain flexes into awkward spaces, so you can cover a second point that no D-lock could reach.
Chains also frustrate an angle grinder slightly more than a fixed bar, because the link shifts and the cut line never stays still. That is the reason serious riders in forums often add a chain alongside their U-lock rather than replacing it.
Where it disappoints
Nine pounds is the number that ends the conversation for a commuter. It is not a lock you carry on a train, and it is not a lock you lift onto a bike that is already hard to lift.
There is also a durability thread in the reviews: one owner reported the lock freezing after several winters outdoors and having to be cut off, and another reported the lock body breaking. Periodic lubrication and dry storage between uses go a long way toward avoiding that.
9. BIGLUFU Folding Lock – The One That Disappears Into a Backpack
BIGLUFU Bike Lock Bicycle Scooter Motorcycle Folding Locks…
Six alloy steel links
Folds to 86cm length
2.14 lb total
Four laser-cut keys
Pros
- Folds small enough for a backpack or bottle cage
- Alloy steel links rated against a 9T hydraulic cutter
- ABS rubber lacquer resists water and scratching
- Four keys included
- Mounts with straps or screws
Cons
- Thinner steel than a U-lock
- so not an overnight anchor
- Folding bars create a small inner gap some frames cannot pass
- Heavier than most folding locks at 2.14 lb
A folding lock solves the problem that stops people using a U-lock at all. It collapses to the size of a water bottle, so you can genuinely carry it every day without resenting it, and that habit is worth more than a heavier lock sitting at home.
The construction is six alloy steel links with a high tensile strength, rated to resist being sheared by a 9T hydraulic cutter as well as sawing and drilling. VSR technology rivets add cut resistance at the joints, and the cylinder is drill resistant.
It opens to 86 cm, which is enough to run through a frame and rear wheel, or around a rack and a wheel. The ABS rubber lacquer cover resists water, rust and frame scratches, and it mounts with non-slip straps or directly to a bottle holder.
Four laser-cut keys are included, which removes the need to remember a code. At 2.14 lb it is heavier than most folding locks, so the portability advantage is about size rather than weight.
What folding locks are actually for
Folding locks trade a little steel for a lot of convenience. The bars are thinner than a U-lock shackle and the pivots are the weak point, which makes them a poor choice for a bike left outside overnight in a high-theft area.
What they are good at is short stops, quick errands, a cafe stop on the way home, and being the second lock you always have with you. Our folding lock guide covers the trade-offs in more detail.
Where it disappoints
The inner gap created by the folded bars is small, and some frames will not fit through it. Measure the narrowest point of your frame before ordering, especially on a compact or step-through e-bike.
Community frustration runs in the other direction too, with riders arguing that folding locks and cables are marketed for e-bikes when they should not be. We agree on overnight use: this is a carry lock, not an anchor.
10. GRIFEMA 3ft Combination Chain Lock – Best When Keys Are a Problem
Anti-Theft Bike Chain Lock, 5-Digit Resettable Combination…
5-digit resettable combination
7mm hardened alloy chain
Nylon protective sleeve
730 g weight
Pros
- No keys to lose
- which shared or family riders like
- 5 digits give over 100000 code combinations
- Combination is resettable whenever needed
- Nylon sleeve prevents frame scratching and blocks weather
- Light at 730 g and coils for easy transport
Cons
- Some owners report the unit would not let them set their own code
- 7mm chain is the thinnest steel in this comparison
- One reviewer describes it as not the safest chain
- though workable
If you have ever locked a bike with a key inside the lock, the keyless argument sells itself. This chain uses a 5-digit resettable combination with more than 100,000 possible codes, and nothing in your pocket to lose.
At 3 ft it suits securing one to three bikes together, or wrapping a rack, pole or gate. It coils down for storage, and at 730 g it is the second lightest option in this roundup.
How 5 digits beat a 4-digit dial
The jump from four to five digits multiplies the code space by a factor of ten, from 10,000 combinations to more than 100,000. That changes brute-force guessing from a plausible attempt into a pointless one.
Because the code is resettable, you can change it whenever someone leaves the code with you, which is a real benefit on shared household or workplace bikes.
Where it disappoints
The 7 mm chain is the thinnest steel here and cuts more easily than anything else in the group. Several reviews describe it as a secondary lock for gates and grills rather than a primary e-bike lock, and we agree with that framing.
The most common complaint is the code mechanism. Some owners report being unable to set their own combination, so test it as soon as it arrives and before you need it in a dark car park.
11. eMjollRay 110dB Alarm Chain Lock – The Loudest Thing on This Page
Bike Chain Lock with Alarm E Scooter Lock Anti-Theft Alarm…
110dB vibration siren
USB-C rechargeable alarm
Two remotes included
8mm chain, 4ft long
Pros
- Genuinely loud 110dB siren that draws bystanders
- Remote lock and unlock avoids reaching the lock in the dark
- USB-C rechargeable with long standby time
- Adjustable volume and motion sensitivity
- Storage pouch included
Cons
- Remote buttons trigger accidentally in a pocket
- Remote indicator light stays on and is distracting
- Low battery warning beep is loud and cannot be disabled
- Lock must be unscrewed to recharge
- 8mm chain is comparatively thin
The alarm is the whole pitch here. A high-precision vibration sensor triggers a 110 dB siren on movement, and in our testing it genuinely carries. It is the loudest deterrent in this roundup by a wide margin, and loudness is what actually makes a passerby look up.
Two remotes let you lock and unlock from a distance, which is the feature owners mention most. No more fishing a key out of a pocket while a stranger walks past.
Both the alarm and the remotes recharge over USB-C with up to 60 days of standby time, so there are no disposable batteries. Volume and motion sensitivity are adjustable, and a reinforced fabric sleeve with a silicone cover stops the lock scratching your frame.
What drags the rating down is the remote. Owners report accidental presses in a pocket, an indicator light that stays on in the dark, and a low battery beep that cannot be switched off. It is the lowest-rated product in our group, and those small annoyances are the reason.
When an alarm earns its place
An alarm works best in a populated place during working hours, where a 110 dB siren brings people to a window. In a quiet street at midnight, sound travels nowhere, and at that point you are relying on the steel alone.
For office and campus parking, or a bike outside a busy cafe for twenty minutes, it adds real protection for a modest weight increase over a plain chain.
Where it disappoints
The 8 mm chain is thin. A determined attacker with cutters does not care how loud the siren is after the first minute, and this is not the lock to rely on overnight in a high-theft area.
Recharging requires unscrewing the lock and the remotes separately, which is a routine you will not always want to perform. Treat the alarm as a useful addition to a layered setup rather than a replacement for one.
12. NDakter 18mm U-Lock with 120cm Chain – The Thick Shackle on a Middle Budget
NDakter Bike Locks Heavy Duty Anti Theft 18mm Thick…
18mm hardened steel shackle
5.5 by 7 inch internal space
6mm x 120cm 3T manganese chain
4.4 lb total
Pros
- 18mm hardened shackle is thicker than most rivals at this level
- Roomy internal dimensions that fit fat tires and wide frames
- 3T manganese steel chain outperforms ordinary cable
- Silicone and nylon covers prevent frame scratches
- Three brass keys plus two sized steel rings for extra options
Cons
- At 4.4 lb total it is heavy to carry every ride
- Included 6mm chain is thin relative to the U-lock
- Listed material type does not match the described hardened steel body
An 18 mm hardened shackle and internal dimensions of 5.5 by 7 inches make this the roomiest U-lock for a fat-tire frame in our group. When a lock is wide enough that you do not have to debate whether the wheel fits, everything about using it gets easier.
The bundle includes a 6 mm by 120 cm chain in 3T manganese steel, which is a step up from a basic cable. Run it through a wheel or a rack for a second contact point and the U-lock handles the frame.
A nylon protector on the chain and a silicone outer protector on the lock body keep both off your paint, and the zinc alloy cylinder is described as resistant to technical opening. Three brass keys are included, and brass is a better choice than thin steel for key longevity.
Two differently sized steel rings give extra locking options, and the chain length is enough to secure several tricycles or fasten a motorcycle to a thick bar. Owners rate it 4.7 and the consistent theme is thick steel for the money.
Why a fat-tire frame changes the math
A wide tire needs internal clearance, not a thicker shackle. If your tire barely passes through the lock, you will end up leaving the bike unlocked or forcing a bad fit that leaves a gap at the frame.
Measure the widest point of the wheel with the bike upright, then add enough room for the tire to be pulled back slightly. The 5.5 by 7 inch interior here is one of the more generous figures in this roundup.
Where it disappoints
At 4.4 lb for the lock and chain together, this is not a light carry. Plan on a pannier, a bag or a bracket, and think about whether you need both pieces every day.
The bundled 6 mm chain is thin next to the U-lock, so treat it as a secondary layer rather than a partner that doubles the protection. The listing also gives an inconsistent material type for the body, which is a small warning about specification detail.
How to Choose a Lock for an E-Bike
Start with where the bike actually spends its time, not with the most impressive lock on the page. A commuter who locks at a rack beside forty other bikes in daylight needs a different answer from someone storing an e-bike in a shared garage overnight.
The second decision is lock type, and it comes down to which attack you are defending against. A D-lock beats leverage and bolt cutters because the rigid shackle gives a thief nothing to lever against. A chain defeats awkward frames and makes an angle grinder’s job harder because the link moves. A folding lock wins on portability and loses on steel. A cable loses on all counts and we would not use one alone on an e-bike.
Third, read the certification. Sold Secure grades locks Bronze, Silver, Gold and Diamond using real-world attack data, and the ART scale runs ART-1 through ART-4 in Europe. Both systems separate pedal cycle grading from powered cycle grading, which matters here: an e-bike needs the higher grade because thieves treat it differently.
Fourth, check the locking area. The internal space of a D-lock is the number that decides whether it fits your frame, and the rule is uncomfortable: a smaller internal area is more secure but harder to use. Fat-tube and integrated-battery frames are where most people give up and leave the bike unlocked, so measure first.
Fifth, budget for two locks rather than one. A heavy anchor for the frame and rear wheel, kept at home or work, plus a light lock that travels with you for the front wheel. This is the setup experienced riders describe in forum threads, and it is the only arrangement that works in every situation.
Protect the battery as well as the bike
Thieves increasingly take the battery and leave the frame. On models where the battery is removable, taking it with you on a long stop is the single most effective step you can take, and it is the mitigation riders mention most often in e-bike communities.
For integrated batteries that cannot be removed, lock the frame through the down tube rather than the seat tube, and keep the lock high on the anchor so it cannot be dropped over a low bar. If your insurer requires a particular lock class, check that before you buy rather than after.
Trackers are a useful second layer for short stops rather than a replacement for a lock. Bluetooth trackers give a location, but thieves now search for them, so hide one in the frame or wheel and keep the real lock doing the work.
What a two-lock setup looks like in practice
Lock the frame and rear wheel to a proper anchor first, with the lock sitting high and the slack kept minimal. Then run the second lock or chain through the front wheel, making sure the wheel cannot be lifted out of the frame. Keep both off the ground, because a lock resting on gravel is a sign to a thief that you are not careful.
If you are building the bike up from an older frame, our electric bike conversion kit guide covers the other half of the picture, because a heavier converted bike needs heavier locks.
Frequently Asked Questions
What is the best way to secure an electric bike?
Use two locks. Anchor the frame and rear wheel to a fixed object with a hardened D-lock that carries a real security rating, then add a chain or second D-lock through the front wheel. Keep the lock high on the anchor, remove the slack, and lift the lock off the ground. For long stops on a removable-battery bike, take the battery with you.
Which eBike lock is the most secure?
Security is a combination of steel quality, locking area and certification rather than bar thickness alone. Among the locks we reviewed, the KOHLBURG is the only one carrying a Sold Secure Diamond rating, while the Kryptonite New York long shackle is the strongest mass and cut resistance for overnight anchoring. Neither survives a battery angle grinder indefinitely.
What bike lock can you not cut through?
No lock is uncuttable. Against bolt cutters and levers a hardened 14mm-plus shackle or a 12mm hardened chain will hold for a meaningful time, and locks that shed a grinder blade are a different category entirely. Battery angle grinders defeat most locks quickly, which is why riders use layered setups and park in visible, populated places.
What is the best anti-theft alarm for an eBike?
The 110dB vibration alarm chain in our roundup is the loudest and most effective at drawing attention, with remote lock and unlock and USB-C recharging. The fat-tire alarm U-lock is the better choice if alarm volume matters less than fitting a 20×4 tire. Treat either as an addition to a hardened anchor, never as a replacement.
What is better, U-lock or chain?
A U-lock is faster to use and defeats leverage and bolt cutters best, but it only fits the frame shapes you can pass it through. A chain reaches awkward spaces and makes an angle grinder’s job harder because the link shifts, at the cost of weight. Most riders end up carrying one of each.
How are bike lock security ratings measured?
Sold Secure tests locks against real-world attack techniques and grades them Bronze, Silver, Gold and Diamond. The ART system in Europe runs ART-1 to ART-4. Both scales grade pedal cycle and powered cycle separately, so an e-bike should be judged on the powered cycle figure rather than the standard bicycle rating.
Are combination locks better than key locks for e-bikes?
Combinations remove the lost key problem and suit shared or family bikes, and a 5-digit code gives far more combinations than a 4-digit dial. Keys are generally harder to attack because there is no dial to observe. Choose based on who else needs access rather than on security level alone.
Do I need to register my e-bike?
Yes, registration and a recorded serial number make recovery possible if the bike is recovered later. Photograph the frame, record the battery serial too, and keep proof of purchase with the insurer. Add a hidden Bluetooth tracker for short stops, knowing that thieves now search for trackers.
The Locking Setup We Would Ride With
If we were locking an e-bike in 2026, the Kryptonite New York Long Shackle would be the anchor, through the frame and rear wheel, with the lock seated high on the rail. Its mass does the quiet work of telling a passerby this bike is not an easy target.
The second lock is whichever one fits the day. A folding lock for a coffee stop, an alarm chain for a loud street, a combination chain when the keys are shared, and a 20 mm or 18 mm U-lock on the front wheel at home. Buying the best bike locks for electric bikes is not about one perfect product; it is about having the right layer ready for how long the bike will be standing there.
Measure your frame, check the insurer’s requirement, and remember that a battery taken with you is a bike that cannot be ridden away.
