Weight is the honest measure of how much steel a lock actually carries · review
A 12 mm U-lock at 2.05 lb with a 4 × 8-inch interior, for quick stops in lower-risk places.
Our conclusion Kryptonite’s light 12 mm Keeper U-lock: 4 × 8-inch interior, 2.05 lb, a vinyl coating and a bracket. For short stops and low-risk areas.
See the best bike lock.
Read on the day this page was built: $47 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text are dated readings and can differ from the live price in the buy box.
| Shackle | 12 mm hardened steel, vinyl coated |
|---|---|
| Interior | 4 × 8 in |
| Weight | 2.05 lb |
| Cylinder | Disc-style, pick and drill resistant |
| Keys and mount | 2 stainless keys; frame bracket |
| Amazon reference | B078HHPQLD |
| EAN | 0720018004196 |
For short stops in low-risk areas. For overnight or city parking, choose 14 to 18 mm.
Yes: two different lock types slow a thief, who needs two tools.
7.5/ 10
Kryptonite’s light 12 mm Keeper U-lock: 4 × 8-inch interior, 2.05 lb, a vinyl coating and a bracket. For short stops and low-risk areas.
Same category, nearby prices, between bike gear. What remains is the specifications every one publishes — half empty, a column is no use.
| Model | Price | Weight |
|---|---|---|
| Kryptonite Keeper Standard (4196) | $47 | 2.05 lb |
| Sportneer 43205-21875 | $14 | Not published; 1.4 lb (0.6 kg) on the shipping record |
| Kryptonite Evolution Mini-7 U-Lock with 4 ft cable | $83 | 3.55 lb (1.61 kg) |
| Master Lock Cable Lock 4 ft, 4-digit combination | $9 | 4.8 oz |
A café stop, a suburban rack, or a second lock for the front wheel
Specifications: the manufacturer sheet for bike gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
14 mm (0.55 in) shackle · Sold Secure Diamond · 6 ft (1.7 m) cable
A large U-lock with a 14 mm (0.55 in) hardened shackle and a Sold Secure Diamond rating, supplied with a 6 ft (1.7 m) cable for the front wheel and accessories.
Best for: Anyone leaving a bike in a city where theft is a real prospect, and who is prepared to carry the weight.
≈ $89.20
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
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
