Kryptonite KryptoFlex 815 Key Cable Lock 5'x8mm

A lightweight, flexible keyed cable lock that is easy to carry and convenient for quick stops or securing bicycle accessories.

The Kryptonite KryptoFlex 815 Key Cable Lock combines a flexible 5-foot braided-steel cable with a simple keyed locking mechanism. Its generous length makes it easy to route through a bicycle frame and wheel or around many common bike racks, while the included frame bracket provides a convenient way to carry the lock between rides.

Best For

• Quick stops in low-risk locations
• Securing a front wheel or other bicycle component
• Use as a secondary lock alongside a U-lock or chain
• Recreational bikes, children’s bikes, and neighborhood riding
• Riders who prefer a keyed lock instead of remembering a combination
• Securing helmets, bike racks, and other appropriate gear

Why We Like It

The KryptoFlex 815 is lightweight, flexible, and simple to use. Its 5-foot length provides enough reach for many common locking situations, while the braided-steel construction offers more cut resistance than an unreinforced cable.

We also like the Easy-Click locking mechanism, which allows the lock to be closed without inserting the key. Two reversible keys are included, and the protective weather guards automatically cover the key cylinder when it is not in use.

Key Features

• Flexible Braided-Steel Cable: The 8mm cable provides basic cut resistance while remaining easy to route through a bicycle frame and wheel.
• Five-Foot Length: Provides useful reach for securing a bike to many commonly encountered racks and fixed objects.
• Easy-Click Locking: The lock can be secured without inserting or turning the key.
• Advanced Key Cylinder: Designed to provide greater resistance to picking than a basic lock cylinder.
• Automatic Weather Guards: Dual sliding covers help protect the key cylinder from dirt, moisture, and road debris.
• Two Reversible Keys: Each key can be inserted either way for easier operation.
• Included Transport Bracket: The EZ-Multi-Fit bracket provides a convenient way to carry the lock on a compatible bicycle frame.
• Kryptonite Key Safe Program: The key number can be registered with Kryptonite to simplify ordering replacement keys if the originals are lost.

Core Specs

• Product type: Keyed bicycle cable lock
• Model: KryptoFlex 815 Key Cable
• Cable construction: Flexible braided steel
• Cable diameter: 8mm (approximately 5/16 inch)
• Cable length: 5 feet (approximately 150cm)
• Locking mechanism: Easy-Click keyed cylinder
• Keys included: Two reversible keys
• Weather protection: Dual sliding cylinder guards with automatic closure
• Color: Black
• Mounting bracket: EZ-Multi-Fit transport bracket included
• Kryptonite security rating: 1 out of 10

Security Recommendation

Cable locks offer flexibility and convenience, but an 8mm cable is intended as a basic theft deterrent rather than high-security protection. For longer stops, higher-risk locations, expensive bicycles, or overnight storage, we recommend using a quality U-lock or hardened chain as the primary lock.

The KryptoFlex 815 can also be used as a secondary lock to secure a front wheel or other component while a stronger primary lock secures the bicycle frame.

Kryptonite has specialized in bicycle security since 1971, when the company introduced its original U-lock design. Its current product line includes U-locks, chains, cable locks, folding locks, and bicycle lights designed for a wide variety of riders and security needs. Kryptonite is part of the Allegion family of security brands.