Kryptonite Keeper 785 Bike Chain Lock, 2.8 ft Heavy Duty Anti-Theft Lock
The Kryptonite Keeper 785 is a 3.5-pound integrated chain lock built with 7mm four-sided manganese steel links and an 85-centimeter reach. Rated 5/10 on the manufacturer's internal security scale, it offers a functional compromise between portable weight and mid-tier theft deterrence.
Research review based on an Amazon listing, recorded specifications and captured buyer ratings. Review record from Sep 22, 2026; price, rating and availability last checked Nov 12, 2026. It does not verify every maker claim. Not a hands-on test — see how we review.
Price
$51.94
Checked Nov 12, 2026
Amazon rating
4.6
★★★★★4.6
Ratings
11,599
Best for Securing mid-value bikes in moderate-risk areas
The 7mm manganese steel links provide a tangible upgrade in physical security over hardware-store chains. The 2.8-foot length is somewhat restrictive, requiring careful positioning against bike racks and street anchors. It strikes a pragmatic balance between portability and daytime deterrence for mid-value bicycles.
What we like
+7mm four-sided hardened manganese steel links
+End-link design secures directly to deadbolt
+Reputable lock manufacturer with replacement key service
What to weigh up
−Short reach limits locking to wider posts
−Noticeably heavy to transport without a dedicated bag
Price, rating and availability as read from the listing on Nov 12, 2026; Amazon can change them at any time. We earn a commission on qualifying purchases.
Our scorecard
Research-based assessment
7.0out of 10
Overall
Build quality7.6
Four-sided 7mm manganese steel links withstand basic hand tools and leverage attacks.
Security level5.2
A 5/10 rating limits use cases strictly to moderate-risk daytime lockups.
Portability6.8
At 3.50 pounds, it is packable but adds noticeable weight to commutes.
Lock cylinder design7.4
Disc-style cylinder resists drilling and picking while securing the direct deadbolt.
Frame protection8.0
The full-length nylon sleeve and rubber casing effectively shield painted bike tubing.
The full review
Design and build
The Kryptonite Keeper 785 centers on an 85cm chain composed of 7mm four-sided links forged from 3T manganese steel. This structural profile creates greater resistance to manual cropping tools than traditional round links of equivalent gauge. Kryptonite integrates the terminal link directly into a hardened deadbolt assembly, removing the traditional padlock shackle as an exposed leverage point. The cylinder utilizes a disc-style mechanism designed to impede drill bits and basic picking tools. Surrounding the steel is a heavy-duty nylon sleeve that protects bicycle frame tubes from contact abrasion and chips. The locking body itself is treated with an exterior rubber coating to cushion incidental strikes against painted components. In terms of mass, the assembly scales at 1.59 kilograms, or 3.50 pounds. The build feels dense and uniform, though buyers should note the warranty section in the technical specifications lists 'No information' alongside claims of limited lifetime support elsewhere.
Real-world performance
In everyday locking scenarios, the 33.5-inch operational circumference accommodates standard bicycle frames paired to common street fixtures, including municipal bike staples and narrow signposts. Securing bulkier structures, such as wide lampposts or high-volume e-bike frames featuring wide down tubes housing integrated batteries, can prove tight. Two ergonomic 'I' keys are provided, engaging the disc tumbler smoothly provided the core is kept free of roadside grit. The chain's flexibility allows it to be threaded through a rear wheel and rear triangle simultaneously, provided the anchoring point is within close proximity. Transport requires dedicated accommodation; the 3.5-pound mass is burdensome inside a light backpack, making a pannier, frame bag, or wrapped top-tube transport preferable. Rated at 5/10 on Kryptonite's internal security spectrum, the Keeper 785 is engineered to delay opportunistic theft rather than defeat determined attacks employing powered angle grinders or full-sized bolt cutters.
Value for money
Priced at $48.49, the Keeper 785 sits in the entry-to-mid tier of branded chain locks. The high consumer feedback volume—averaging 4.6 stars across more than 11,000 ratings—indicates reliable manufacturing consistency at this price point. Buyers gain access to Kryptonite's KeySafe program, enabling replacement key orders if registered promptly post-purchase, as well as potential eligibility for the Anti-Theft Protection Offer. Compared to standard steel cable locks that offer virtually zero cutting resistance, this 7mm manganese chain provides substantially better material protection per dollar. However, when safeguarding higher-value investments—such as heavy commuter e-bikes where motor torque and battery replacements exceed four figures—budgeting higher for thicker 10mm-plus links or hardened U-locks may be prudent. For standard commuter bicycles under daylight supervision, the Keeper 785 offers adequate metal for the sub-$50 investment.
Who should skip it
Riders who regularly leave their bicycles locked unattended overnight in major metropolitan centers should pass on this lock. A 7mm chain link can be compromised by professional manual cutting gear or portable cordless angle grinders in short order. Similarly, owners of heavy cargo bikes or oversized e-bikes will find the 85-centimeter length insufficient to span larger frame geometries and immovable anchors. If your bike lacks quick-release components and requires comprehensive front-to-back locking through both wheels and the frame, this single chain lacks the necessary reach. Ultra-lightweight commuters who refuse to carry three and a half pounds of dead weight should also consider compact mini U-locks instead. For severe high-theft corridors, hardware rated at 8/10 or higher on the security scale is required, leaving the Keeper 785 best reserved for brief errands and moderate-risk daytime settings.
Specifications
Recorded from the listing
Included Components
Bicycle Lock
Recommended Uses For Product
Security
Number of Pieces
1
Model Number
720018000853
Model Name
Kryptonite Keeper 785 Integrated Chain
Number of Packs
1
Item Type Name
Kryptonite Keeper 785 Integrated Bicycle Lock Chain Bike Lock, 33.5-Inch, Black
Additional Features
Portable
Brand Name
Kryptonite
Manufacturer Warranty Description
No information
Number of Items
1
Manufacturer
Kryptonite
Unit Count
1 Count
Manufacturer Part Number
000853
What to confirm for this exact model
Potential fit
Securing mid-value bikes in moderate-risk areas. Confirm that the model and included equipment meet your intended use.
Trade-off to resolve
Short reach limits locking to wider posts Check whether this matters for your setup before ordering.
Included equipment and compatibility
Check the exact variant, quantity, dimensions, required accessories and any applicable power or connection requirements. A missing specification is unknown, not proof that a feature is absent.
Ownership and purchase terms
Verify seller, delivered price, return conditions and manufacturer warranty for your location. Check replacement parts and ongoing costs where applicable.
Recorded price history
3 checks · Sep 22, 2026 to Nov 12, 2026
Prices we read from the Amazon listing on each check, for the new item as sold on the listing page. They are snapshots between checks, not a complete price record; offers can change several times a day.
Latest
$51.94
Lowest recorded
$48.49
Sep 22, 2026
Highest recorded
$51.95
Since previous
−$0.01
0% (small)
Each recorded price check
Checked
Price
Read from
Nov 12, 2026
$51.94
Listing page
Nov 8, 2026
$51.95
Listing page
Sep 22, 2026
$48.49
Listing import
What the maker claims
—HEAVY-DUTY CHAIN: Made from 7mm manganese steel with four-sided links, this bike lock provides maximum resistance against cutting and leverage attacks
—PATENTED LOCKING SYSTEM: Features a high-security disc-style cylinder, resistant to picking and drilling, and a patented end link design that securely connects the chain to a hardened deadbolt, eliminating weak points
—PROTECTIVE FEATURES: Durable rubber coating around helps prevent scratching and wear and tear on your bike. Durable WEATHER-RESISTANT nylon sleeve prevents scratches
—DURABLE DESIGN: Keeper 785 Integrated Chain extends up to 85cm (33.5 in) in circumference, crafted from 7mm hardened steel links. Heavy-duty bike lock weighs 1.59kg (3.50 lbs). Includes two keys and rated 5/10 for moderate security on our scale.
—ATPO & KEYSAFE PROGRAM ELIGIBLE: Register to qualify for Kryptonite's Anti-Theft Protection Offer and KeySafe key replacement service
—LIFETIME WARRANTY AND SUPPORT: Kryptonite offers a limited lifetime warranty for peace of mind. If you experience any issues, contact our Customer Experience team, and we will resolve it quickly. We are committed to your satisfaction and product quality
Where it ranks
Same-type shortlists
Positions among e-bikes & cycling accessories listings whose titles confirm the same product type, ordered by editorial score and then buyer rating. Budget positions use the recorded price ($51.94), which can change.
Alternatives are selected by recorded product-type relevance and price proximity. Confirm exact purpose and compatibility; a shared category does not guarantee interchangeability.
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Rating
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Kryptonite Keeper 785 Bike Chain Lock, 2.8 ft Heavy Duty (this one)
A dash means the value was not recorded, not that a feature is absent. Prices and ratings are captured snapshots; editorial scores are research assessments rather than measured performance.
Common questions
Can the Kryptonite Keeper 785 withstand angle grinder attacks?
No. The 7mm manganese steel links are engineered for moderate defense against hand tools like bolt cutters and hacksaws. Powered angle grinders with abrasive discs will cut through 7mm chains in seconds. High-risk zones require specialized, thick-gauge anti-angle-grinder locks rather than mid-tier chain hardware.
Is an 85cm chain long enough for locking an electric bike?
It depends on the frame design. The 85-centimeter circumference provides enough reach to capture standard bicycle tubes and thin posts. However, heavy e-bikes with wide battery downtubes may consume most of the chain length, leaving insufficient slack to secure the frame and wheel to wider street furniture.
How do you obtain replacement keys for the Keeper 785?
Kryptonite includes two ergonomic keys with the lock. To qualify for replacements, buyers must register the specific key number via Kryptonite's KeySafe program immediately after purchase. If registered, the company can provide replacements if both original keys are lost during regular daily ownership.
Does the chain scratch or damage painted bicycle frames?
The steel links are enclosed in a durable, weather-resistant nylon sleeve that prevents metal-on-frame contact along the chain. Additionally, the integrated locking head features a protective rubber exterior, which cushions the lock mechanism against painted frame sections during routine locking and unlocking procedures.
How we judge e-bikes & cycling accessories
Rule 01
Torque, not top speed, is what you feel on a loaded hill start.
Rule 02
Verify exact-model UL 2849 certification for the e-bike electrical system; UL 2271 applies to battery packs. A listed component alone does not certify the whole bike.
Rule 03
Check brake type, rotor size and maintenance requirements against total load, terrain and intended speed; bike weight alone does not establish stopping performance.
Sources and limits
This page summarizes our research reviews of Amazon listings, listed specifications and captured buyer ratings. It is not a hands-on test. Scores are editorial assessments, not measured performance; prices are recorded snapshots and may change. A category can include both main products and accessories, so its overall price range is not the cost of a complete setup.
Most recent product record update: September 22, 2026. Individual records may be older; this is not a verification date for every claim. Prices on this page were read from the listings Nov 12, 2026.
