U-lock
Compare the listed 10 mm Kryptonite, 12 mm ABUS, and 14 mm OnGuard shackles. Check each lock’s interior dimensions and frame-fit note.
Buyer’s guide
Five picks for the daily café-and-back run, the overnight in a garage, or the step-through frame that a regular chain cannot wrap. Each row carries the shackle spec, interior dimensions, lock type, weight, the one reason we keep it on the list, and the cheapest live Amazon price we found at issue. Commissions from these links fund the rest of the catalog — see our affiliate disclosure.
Choosing a lock type
Use the selector below to narrow by type, then compare the listed dimensions, weight, and frame-fit notes with your bike and parking point.
Compare the listed 10 mm Kryptonite, 12 mm ABUS, and 14 mm OnGuard shackles. Check each lock’s interior dimensions and frame-fit note.
Foldylock Compact is listed at 85 cm unfolded, with six hardened-steel rivets and a bottle-cage bracket. Its fit note covers curved and step-through top tubes.
Hiplok Gold has an 85 cm loop, 8 mm chain, and an adjustable waist or shoulder buckle. Its listed weight is 1.6 kg.
| Lock | Key specs | Fit / test note | Price | Buy |
|---|---|---|---|---|
For the daily commuter who locks to a Sheffield stand for ten minutes, the OnGuard Pitbull Mini DT holds the best balance of shackle thickness and bottle-cage-friendly form. For step-through frames where a U-lock simply refuses to close, the Foldylock Compact threads through the curved top-tube where a chain cannot. Riders who carry the lock over the shoulder every commute get the most value from the Hiplok Gold— 8mm steel and the only pick on the list with a wearable buckle. Below $40 the ABUS 410 and the Kryptonite Evolution Mini-5 do everything a commuter actually needs from a lock at 90% of the price.
Pick by where you lock: café stand at street level → OnGuard Pitbull Mini DT or Kryptonite Evo Mini-5. Step-through frame or folding commuter → Foldylock Compact or ABUS 410. Wear it over your jacket → Hiplok Gold. Every Buy button ships through Amazon with the same Associates tag the rest of the catalog uses, so the price you pay stays exactly what Amazon lists.
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