Kryptonite Keeper 12 Long – 12 mm Long Shackle Bicycle U-Lock
The Kryptonite Keeper 12 Long U-lock combines durable hardened steel construction with an extended shackle design for greater flexibility when securing a bicycle. Featuring a 12 mm hardened steel shackle, an anti-rotation deadbolt and a disc-style locking cylinder, it provides a practical security solution for commuting, recreational cycling and everyday bicycle parking.
With dimensions of 10.2 × 25.4 cm (4 × 10 inches), the Keeper 12 Long offers additional locking space compared with the standard Keeper 12 model. Its extended design makes it easier to accommodate certain bicycle frames and fixed parking structures.
Rated 5/10 on Kryptonite's security scale and certified Sold Secure Pedal Cycle Silver, this U-lock is designed for cyclists seeking moderate security with added locking flexibility.
Key Features
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12 mm hardened steel shackle: Provides a robust construction designed to resist common hand tools.
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Extended shackle design: The 25.4 cm length offers approximately 5.1 cm of additional locking space compared with the Keeper 12 Standard.
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Hardened anti-rotation deadbolt: Reinforced locking mechanism designed to resist twisting forces.
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Disc-style cylinder: Features a centrally positioned keyway for additional resistance to tampering.
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Kryptonite security rating of 5/10: Moderate security intended for everyday bicycle parking.
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Sold Secure Silver certification: Independently tested and certified under the Pedal Cycle category.
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Protective vinyl coating: Helps reduce direct metal contact with the bicycle frame.
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Two stainless steel keys: Ergonomic design intended to reduce excessive torque during operation.
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Included mounting bracket: Side-mounted snap-in bracket facilitates transportation on a compatible bicycle.
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Kryptonite Key Safe Program: Eligible for replacement key services according to the manufacturer's conditions.
Technical Specifications
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Brand: Kryptonite
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Model: Keeper 12 Long / Keeper LS
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Manufacturer part number: 004202
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Product type: Long-shackle bicycle U-lock
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Shackle material: Hardened steel
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Shackle diameter: 12 mm
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Lock dimensions: 10.2 × 25.4 cm (4 × 10 inches)
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Manufacturer-listed weight: Approximately 1.02 kg (2.25 lb)
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Locking mechanism: Hardened anti-rotation deadbolt
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Cylinder: Disc-style with center keyway
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Kryptonite security rating: 5/10
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Independent certification: Sold Secure Pedal Cycle Silver
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Protective coating: Vinyl
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Keys included: Two stainless steel keys
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Mounting bracket: Included
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Additional security cable: Not included
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Color: Black
Extended Shackle for Greater Locking Flexibility
The main advantage of the Keeper 12 Long is its extended U-shaped shackle.
Measuring 25.4 cm in length compared with 20.3 cm for the standard version, it provides approximately 5.1 cm of additional space when positioning the lock around a bicycle frame and a suitable fixed object.
This extra clearance can be particularly useful with larger frame tubes, certain bicycle geometries or parking racks that are difficult to reach with shorter U-locks.
The longer shackle also offers more flexibility when selecting a locking position, although riders should always minimize unused space inside the lock whenever possible.
Durable 12 mm Hardened Steel Construction
The Keeper 12 Long features a 12 mm hardened steel shackle designed to provide resistance against common hand tools.
Its rigid steel construction offers a more substantial security solution than basic flexible cable locks.
The protective vinyl coating helps reduce the risk of cosmetic scratches when the lock comes into contact with the bicycle frame during everyday handling.
Reinforced Locking Mechanism
The lock incorporates a hardened deadbolt with an anti-rotation design intended to improve resistance against twisting forces.
A disc-style cylinder with a centrally positioned keyway provides an additional security feature.
Together, these components create a practical locking system for cyclists who want dependable everyday protection.
Moderate Security with Independent Certification
Kryptonite assigns the Keeper 12 Long a security rating of 5 out of 10.
The model also carries a Sold Secure Pedal Cycle Silver certification, providing independent confirmation that it meets the corresponding testing requirements.
This makes the lock a relevant choice for commuting, recreational rides and everyday stops in moderate-risk environments.
For extended parking in locations with a higher risk of bicycle theft, a higher-security lock or additional locking protection may be more appropriate.
Practical Transportation and Everyday Convenience
Despite its extended dimensions, the Keeper 12 Long includes a side-mounted snap-in bracket designed to facilitate transportation on compatible bicycle frames.
Two ergonomic stainless steel keys are supplied, allowing cyclists to keep a spare key available.
The Kryptonite Key Safe Program also provides access to replacement key services, subject to the manufacturer's registration requirements and conditions.
A Versatile U-Lock for Everyday Bicycle Security
The Kryptonite Keeper 12 Long bicycle U-lock is particularly well suited for cyclists who appreciate the construction and moderate security of the Keeper 12 Standard but require additional locking space.
With its extended 25.4 cm shackle, hardened steel construction, reinforced locking mechanism and practical mounting accessories, it offers a convenient solution for everyday bicycle security.
Package Contents: One Kryptonite Keeper 12 Long U-lock, two stainless steel keys and one mounting bracket.
