U-locks
Is the Kryptonite Keeper enough, or do I need the Evolution?
Both are Kryptonite U-locks with a disc cylinder and a frame bracket. The Keeper is the light one; the Evolution adds 2 mm of steel and a second locked end.
| Compared on | Keeper Standard (4196) | Evolution Standard (2130) |
|---|---|---|
| Shackle | 12 mm, vinyl coated | 14 mm hardened steel |
| Locking | Not published as double | Double deadbolt |
| Weight | 2.05 lb | 3.50 lb |
| Interior | 4 × 8 in | 4 × 9 in |
| Keys | 2 | 3 |
| Warranty | Not published in the listing | Lifetime, plus anti-theft offer for registered locks |
| Listed on amazon.com | Yes | Yes |
A tick marks the better answer on that line only. Counting ticks does not decide the page — the two verdicts below do, because these products answer different questions.
Buy the Keeper for café stops, low-risk racks or as a second lock for the front wheel: under two and a half pounds is a lock you will actually carry.
Buy the Evolution for a bike left for hours where theft is common: the double deadbolt and 14 mm shackle are the difference, and the warranty and theft offer back it.
Yes: the Evolution on frame and rear wheel, the Keeper on the front wheel.
Yes, both listings include one.
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
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
