9 Best Ebike Chain Lock | Keyless Security That Actually Holds

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A keyless 5-digit combo lock that delivers up to 100,000 possible codes so you never scramble for keys again.

The 5-digit combo with 100,000 codes removes the need to carry keys. Owners mention it’s simple enough that even the first-time setup takes seconds, and the keyless convenience makes quick stops painless.

At 3FT it’s “perfect” for a single e-bike, as owners describe it, and the hardened steel links resist cutting and tampering for daily commuting. The scratch-resistant fabric cover does double duty: it protects your frame and makes the chain easier to handle during transport. One reviewer noted it’s “solid and yet not so heavy that they don’t affect your ride” — a key balance for commuters who pedal with their lock onboard.

The 3FT chain is short, so you’ll only reach a standard rack with one bike. Buyers who wanted to wrap two bikes or a thicker pole wished they’d sized up, and reviewers describe the weight as “a little bit heavy.” If you lock just one bike to a typical rack, this works; for more reach, pick a longer model.

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A two-piece security system pairing an 18mm hardened steel U-lock with a flexible 4FT chain for maximum coverage.

The 18mm U-lock secures the frame while the 4FT chain wraps around poles or multiple bikes. The U-lock uses a 0.7 inch (18mm) hardened steel shackle — the part that actually gets attacked — and the 4FT chain adds reach for wrapping around poles, signs, or even locking 3 to 4 tricycles together. It’s a genuinely flexible system at 4.4 lbs total, and customers note it works great for securing e-bikes to carriers at night.

The chain itself is 6mm, made from high-quality 3T manganese steel (a hard, wear-resistant alloy that resists cutting better than standard steel cable). It’s wrapped in a durable nylon protector to keep your frame scratch-free, while the U-lock’s silicone cover adds weatherproofing for outdoor use. The ergonomic U-lock cylinder is zinc alloy and comes with 3 brass keys.

The honest catch: at 6mm, the chain is on the thinner side. As one buyer mentioned, it’s “too thin not really a deterrent” on its own — this lock works best as a layered defense, pairing the U-lock with the chain for double coverage. Moped owners love that the compact U-lock fits inside seat trunks.

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A 10mm heat-treated chain that buyers swear nobody is getting through, paired with a 16mm U-lock for double security.

The 10mm heat-treated manganese steel links resist cutting, breaking, sawing, and shearing. The 10mm manganese steel square links are heat-treated to resist cutting, breaking, sawing, and shearing, and the package adds a 16mm U-lock with a 0.64-inch carbon structural steel shackle wrapped in PVC for corrosion resistance. The total weighs in at 5.62lbs for 3.3FT — heavy, but as one buyer put it, “heavier than other locks, but more secure.”

The lock cylinder uses a zinc alloy blade design with a dust cover, so it won’t jam up with dirt and debris over time. Three copper keys are included, and the chain comes wrapped in a flexible sleeve cloth that’s scratch-proof and wear-resistant. The “noose” or cinch mechanism at the end lets you loop the chain through itself for a tighter fit, giving you more flexibility without carrying extra length.

Buyers describe it as “super heavy duty” and “a serious deterrent for theft,” though they’re honest that any angle grinder can eventually defeat it. The weight is the real cost — for a standard (non-electric) bike, it would add noticeable bulk. For an e-bike, the trade-off is worth it.

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A 4-sided 3T manganese steel chain with a Sold Secure Gold rating, wrapped in a smart-key combination lock.

Kryptonite is the brand serious cyclists trust, and the Keeper 790 shows why. The chain uses 4-sided 3T manganese steel links at 7mm thick, and it carries a Sold Secure Gold rating — a third-party certification meaning it’s been tested against real theft tools like bolt cutters. The 4-digit resettable combination offers over 10,000 codes, so you can pick a number you’ll actually remember.

What stands out in the feedback is how easy it is to use. The large combination dial is readable and smooth, the chain cover prevents scratches, and at 3ft it’s long enough to secure an e-bike to a rack. One buyer who lost two bikes to cable locks switched to this and called it “far superior” — a common theme. The end link locking point gives you extensive holding power.

The honest reality: the combination mechanism is the weak point. Some reviewers point out the combo can be picked in 5-10 minutes by a skilled thief, and a few had issues with the lock not opening after multiple uses. It’s also on the heavier side at 3.8 pounds. For moderate-risk areas and daily commuting, it’s excellent; for overnight high-theft parking, you’d want a keyed upgrade.

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The 4FT length that e-bike owners call perfect, backed by Kryptonite’s trusted name and a weather-resistant sleeve.

You’ll notice the length first. At 4ft (approx. 120cm), this Keeper 712 reaches around thick poles, through frames, or even secures two bikes together — and buyers consistently call it “perfect for an ebike.” The 7mm four-sided 3T manganese steel links resist cutting, so a thief with bolt cutters will struggle, and the whole lock weighs about 4.5 lbs (2.04kg), which is manageable for most commutes.

It carries a Sold Secure Bronze rating and scores 5/10 on Kryptonite’s internal security scale, which translates to solid protection for moderate-risk areas and everyday commuting. The weather-resistant nylon sleeve protects your frame from scratches and shields the chain from the elements. The 4-digit resettable combination gives you over 10,000 codes, and Kryptonite’s Combo Safe Program stores your code online in case you forget it.

The catch is honest: this is not for high-theft zones. Buyers are blunt that it’s “good for low-risk areas” and that a determined thief with the right tools could cut through it. For most commuters locking up to public racks, it hits a great balance between security and convenience. Kryptonite also backs it with a limited lifetime warranty.

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12mm hexagonal links of triple heat-treated boron manganese steel that make bolt cutters a laughable threat.

The 12mm hexagonal links and 9-pound weight demand a real commitment to carrying bulk. The 12mm hexagonal links are made from advanced triple heat-treated boron manganese anti-rust steel, with a narrower inner width specifically designed to stop bolt cutters and leverage attacks. The included 18mm U-lock uses a hardened steel shackle with a double deadbolt mechanism. At 9 pounds for the 3.3 ft chain, this isn’t for the faint of heart — it’s for people who refuse to lose their bike.

Shoppers say it successfully thwarted actual theft attempts, and one owner noted thieves “couldn’t cut it” and moved on. The cinch loop circle link extends the chain’s flexibility, letting you connect to trees, fences, lampposts, or even a second vehicle while carrying less bulk. The weather-resistant embroidered sleeve protects your frame, and a sliding dust cover keeps the cylinder working in tough conditions. Four brass steel reversible keys come included.

The honest weight: this is 9 pounds of steel. Some buyers carried it around their waist or on a crossbar, but it’s a load. The recurring gripe involves the key accessibility and durability — the tumbler mechanism showed mixed feedback, with some reporting issues after extended outdoor use in harsh winters. This is max security with a real physical cost.

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An 8mm hardened steel chain with stainless steel combination dials and a Sold Secure Gold rating — rare for a combo lock.

Combination locks usually mean weaker security, but the KOHLBURG Gothenburg flips that assumption. It holds a Sold Secure Gold rating — the highest certification level — and the 8mm hardened steel chain uses square-shaped links tested against bolt cutter attacks. The lock head uses stainless steel combination dials instead of cheap plastic, making it highly resistant to hammer attacks.

At 43 inches long, it’s long enough to secure both the front wheel and frame to a fixed object, or to lock up a motorcycle or multiple bikes at once. Owners describe it as “super burley” and “long enough to get both tires,” and it works well as an e-bike, scooter, or moped lock. The 5.1 lbs weight is a deliberate trade-off — the manufacturer is upfront that “security comes with weight,” and they’re right.

The combination setup is the catch. Buyers warn to read the instructions carefully — one owner ripped off the cap without resetting the code to 0000 first and had to superglue it back. Durability is mixed: some find it plenty sturdy, while a few report issues after a month of use. Still, for the security you get per dollar, it stands out in the premium tier.