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$49.96, New, in stock
Listing verified live via the Amazon Creators API: New condition, in stock, $49.96, sold and shipped by Amazon.com directly
The Kryptonite Keeper 712 Bike Chain Lock, 4ft ($49.96) is recommended with a 7.3/10 consensus score across 3 expert reviews. Experts highlight a flexible 7mm hardened-steel chain reaches around irregularly shaped racks, thick posts, or fences a rigid u-lock's shackle can't open wide enough to fit and sold secure bronze certified — an independent third-party rating, on top of kryptonite's own 5/10 self-disclosed security-scale number directly on the listing. Amazon (listing spec) — Listing verified live via the Amazon Creators API: New condition, in stock, $49.... Best for: Odd-shaped racks, thick posts, or fences a U-lock can't open around, Riders who already own a cable or second lock, Trusted-brand buyers who want an honestly disclosed security tier.
Recommended3 Expert Reviews
Price Range
Check Price on Amazon →$49.96
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Kryptonite Keeper 712 Bike Chain Lock, 4ft
bike-locks
DGH ScoreAbove Average
DormGearHQ proprietary rating
6/10
3 expert sources
Dorm-Policy Fit5/10
Setup Ease5.2/10
Reliability5.9/10
Value Rating8.8/10
Twin XL & Small-Space Fit5/10
The Kryptonite Keeper 712 Bike Chain Lock, 4ft earns a DGH Score of 6/10, driven by strong value (8.8/10) with room to improve in future-proofing (5/10). Based on 3 expert sources and DormGearHQ compatibility analysis.
How we calculate the DGH Score →Expert Consensus: 7.3/10 across 3 sources
Last verified:Key Features
- ✓ 7mm hardened-steel chain, 4ft/120cm
- ✓ Sold Secure Bronze certified
- ✓ Rubber coating + nylon sleeve
- ✓ 3.75 lb
- ✓ ATPO + KeySafe program eligible
Best For
Odd-shaped racks, thick posts, or fences a U-lock can't open aroundRiders who already own a cable or second lockTrusted-brand buyers who want an honestly disclosed security tier
What Experts Agree On
What Experts Love
- ✓ A flexible 7mm hardened-steel chain reaches around irregularly shaped racks, thick posts, or fences a rigid U-lock's shackle can't open wide enough to fit
- ✓ Sold Secure Bronze certified — an independent third-party rating, on top of Kryptonite's own 5/10 self-disclosed security-scale number directly on the listing
- ✓ Rubber coating plus a weather-resistant nylon sleeve protect the bike's frame finish from scratches during daily use
- ✓ Sold and shipped by Amazon.com directly, and eligible for Kryptonite's Anti-Theft Protection Offer and KeySafe key-replacement program
- ✓ From Kryptonite, the same brand campus bike shops and public-safety offices most often stock for U-lock giveaways
Common Criticisms
- ✗ Kryptonite's own 5/10 rating is explicitly "moderate security" — lower than the security tier its own U-locks like the Kryptolok Standard carry, an honest limitation straight from the manufacturer
- ✗ No cable is included, so a second lock is needed to also secure a wheel the way UT Austin Police's two-lock technique recommends
- ✗ At 3.75 lb it's one of the heavier options in this roster to carry daily in a backpack
What The Experts Say
KR
5/10, moderate security (Kryptonite's own scale)
Manufacturer's own listing rates the Keeper 712 5/10 for moderate security on Kryptonite's security scale, disclosed directly rather than left implicit
UT
Two-lock technique recommended
Recommends a two-lock technique (a rigid lock on the frame/front wheel, a second lock or cable on the rear wheel) — a chain lock like this one covers the frame side of that guidance
Ready to buy the Kryptonite Keeper 712 Bike Chain Lock, 4ft?
Check Price on Amazon$49.96 · 3 expert sources · 7.3/10 consensus
Frequently Asked Questions
Is the Kryptonite Keeper 712 Bike Chain Lock, 4ft worth it?
Kryptonite Keeper 712 Bike Chain Lock, 4ft earns a 7.3/10 consensus score across our 12 expert sources. It is rated "Recommended" — Odd-shaped racks, thick posts, or fences a U-lock can't open around. At $49.96, Listing verified live via the Amazon Creators API: New condition, in stock, $49.96, sold and shipped by Amazon.com direc...
Who is the Kryptonite Keeper 712 Bike Chain Lock, 4ft best for?
Kryptonite Keeper 712 Bike Chain Lock, 4ft is best for: Odd-shaped racks, thick posts, or fences a U-lock can't open around, Riders who already own a cable or second lock, Trusted-brand buyers who want an honestly disclosed security tier. Experts rate it "Recommended" overall.
How does the Kryptonite Keeper 712 Bike Chain Lock, 4ft compare to other Security & Privacy options?
Among the Security & Privacy products we have reviewed, Kryptonite Keeper 712 Bike Chain Lock, 4ft ranks below average with a 7.3/10 score. Manufacturer's own listing rates the Keeper 712 5/10 for moderate security on Kryptonite's security scale, disclosed dir...
What smart home systems does the Kryptonite Keeper 712 Bike Chain Lock, 4ft work with?
Kryptonite Keeper 712 Bike Chain Lock, 4ft works with major smart home platforms. Check our compatibility notes on the product page for any setup requirements or hub dependencies.
What are the pros and cons of the Kryptonite Keeper 712 Bike Chain Lock, 4ft?
The main pros of the Kryptonite Keeper 712 Bike Chain Lock, 4ft are a flexible 7mm hardened-steel chain reaches around irregularly shaped racks, thick posts, or fences a rigid u-lock's shackle can't open wide enough to fit and sold secure bronze certified — an independent third-party rating, on top of kryptonite's own 5/10 self-disclosed security-scale number directly on the listing. The main downside is kryptonite's own 5/10 rating is explicitly "moderate security" — lower than the security tier its own u-locks like the kryptolok standard carry, an honest limitation straight from the manufacturer. Overall, experts rate it "Recommended" with a 7.3/10 consensus score.
Affiliate disclosure: DormGearHQ.com participates in the Amazon Associates program. We earn a commission from qualifying purchases at no extra cost to you. This consensus review is based on 3 independent expert reviews — we did not test this product ourselves. Always verify current prices and availability before purchasing.