Kryptonite Keeper Bike U-Lock Standard with Braided Steel Cable, Heavy Duty Anti-Theft Bicycle U Lock, 12mm Shackle and 10mm
Reviewed 30 August 2026 · price checked live
Check price on Amazon →Overview
Kryptonite Keeper Bike U-Lock Standard with Braided Steel sits in our cycling listings, where we rank by how buyers actually rate a product rather than by brand. The manufacturer says: 12mm HARDENED PERFORMANCE STEEL SHACKLE. New hardened double deadbolt design with anti-rotation resist against twist. Those are the seller's own claims rather than our testing, so treat them as a starting point. On Amazon it holds 4.4 out of 5 from 5,301 ratings. What that score is worth next to its rivals is set out below.
- Brand
- Kryptonite
- Amazon rating
- 4.4 / 5 from 5,301 ratings
- vs Cycling
- 0.1 below the category median of 4.5
- Rank in category
- 18 of 20 rated cycling we track
- Price position
- Towards the top of the range (category spans £3.79 to £450)
- How proven
- Well established, above-average review volume
How it compares in Cycling
Across the 20 rated cycling products we track, the typical score is 4.5 out of 5. This one sits at 4.4, which is in the bottom quarter of the category. That does not make it a bad buy, but there are better-rated alternatives on the same shelf, so it needs another reason to earn your money.
It carries 5,301 ratings against a category median of 4,069. That is enough of a base to take the score seriously without treating it as settled.
On price it sits in the upper third of a category running from £3.79 to £450, where the midpoint is about £10.98. Paying above the category norm needs a reason beyond the rating, because the score alone does not justify the gap here.
Worked out from the 20 cycling products in our catalogue, not from the brand's own claims. How we rank →
Key features
- 12mm HARDENED PERFORMANCE STEEL SHACKLE
- New hardened double deadbolt design with anti-rotation resist against twist
- Disc-style cylinder
- Includes click style TRANSPORTATION BRACKET
- Includes 4' flex cable for securing front wheel or other accessories
