United States
U-locks and chains
Kryptonite has 1 product on this site, on the Bike locks shelf. Prices are the ones we read on Amazon.com on October 31, 2026, and each review shows the live price.
| Product | Price | Best for |
|---|---|---|
| Evolution Mini-7 U-Lock with 4 ft cable | $82.88 | City riders who lock to a standard bike rack for hours |
We list what Kryptonite publishes on each Amazon.com listing, and we say what is missing. A brand page is not a ranking: a score, where a review has one, only compares products on the same shelf.
Three formats dominate, and each trades security against how it carries: a folding lock stows compactly on the frame and wraps around awkward stands, a U-lock resists leverage best for its weight but only reaches what fits inside its shackle, and a chain covers the most anchor points while being the heaviest to carry. We compare format, the length or shackle clearance the manufacturer states, key against combination cylinders, whether a frame bracket is supplied, and whether an independent body such as Sold Secure has rated the lock, which is the only claim on a lock you can check. Not one manufacturer in this category publishes a weight, which is a real gap: weight is the honest measure of how much steel a lock carries.
measure around the stand you actually use — through the frame, the rear wheel and the post — before choosing a length. That figure, not the lock’s own dimensions, is what decides whether it closes. And read your insurance policy: some name a certification scheme, and an uncertified lock can void a claim however solid it is. The full comparison is on the bike locks shelf.
13 mm shackle · double deadbolt · Sold Secure Gold · 3.25 × 7 in · 3.55 lb
A compact U-lock with a 13 mm hardened shackle, double-deadbolt locking, a Sold Secure Gold rating and a 4 ft double-loop cable.
Best for: City riders who lock to a standard bike rack for hours.
≈ $82.88
14 mm shackle · double deadbolt · 4 × 9 in interior · 3.5 lb · disc cylinder · FlexFrame-U bracket · 3 keys · lifetime warranty · ATPO
A 14 mm U-lock with a double deadbolt, a 4 × 9-inch interior, a frame bracket and a lifetime warranty.
Best for: A daily commuter bike locked at work and at the store
≈ $126
12 mm hardened steel · 4 × 8 in interior · 2.05 lb · vinyl coating · disc cylinder · bracket · 2 keys
A 12 mm U-lock at 2.05 lb with a 4 × 8-inch interior, for quick stops in lower-risk places.
Best for: A café stop, a suburban rack, or a second lock for the front wheel
≈ $47
18 mm shackle · double deadbolt · steel crossbar sleeve · 3.25 × 6 in interior · 4.55 lb · 10/10 Kryptonite rating · 3 keys · lifetime warranty
An 18 mm mini U-lock rated 10/10 on Kryptonite’s scale, with a double deadbolt and a sleeved crossbar.
Best for: An expensive bike or e-bike parked in the highest-risk places
≈ $180
16 mm hardened steel shackle · anti-rotation · disc cylinder, pick and drill resistant · dust cover · FlexFrame-U bracket · 2 keys
A 16 mm hardened-steel U-lock for high-risk areas, with anti-rotation features, a disc cylinder and a frame bracket.
Best for: A valuable bike locked for hours in a city where theft is common
≈ $138
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
