Bicycle Chain Lock FISCHER 85865 — 8 mm Steel Chain, 800 mm Length, Combination Lock, 3M Reflective Coating

Bicycle Chain Lock FISCHER 85865 is a chain-style security device designed for everyday urban and commuter use. It features an 8 mm thick steel chain with an overall length of 800 mm and a numeric combination lock that eliminates the need for keys. The chain is protected by a 3M reflective coating which improves visibility in low-light conditions and helps reduce accidental contact with painted surfaces.

Advantages

The 8 mm steel links deliver a balance between weight and resistance to casual theft attempts while the 800 mm length provides enough reach to secure a bicycle to racks, posts or other fixed objects. The numeric combination lock offers convenient keyless operation and simple sharing of access codes. The 3M reflective coating increases visibility at night for added safety without adding bulk to the chain.

Suitable for

• Commuter and city bicycles parked at racks, bike stands, or street posts
• Short-term stops in urban environments where medium-level security is adequate
• Situations where keyless, shared access is preferred (numeric combination)

When it may not be suitable

This chain lock is intended for deterrence and medium-level protection; it may not provide sufficient security against determined thieves using power tools or heavy cutting equipment. For prolonged storage in high-risk locations or for high-value bicycles, a heavier-duty lock or an additional locking method is recommended.

Key specifications

• Chain thickness: 8 mm steel links
• Overall chain length: 800 mm
• Lock type: numeric combination mechanism (keyless)
• Exterior finish: 3M reflective coating

How to use

Wrap the chain around the bicycle frame and a fixed object such as a rack or post, ensuring the chain passes through the frame and, if possible, the rear wheel. Align both chain ends and set the numeric combination to lock the mechanism according to the supplied instructions. Verify the lock is engaged and scramble the combination to prevent unintended opening. To unlock, enter the set combination and release the mechanism. Periodically inspect the chain and lock for wear or corrosion, and keep the combination secure but memorable.

What to consider before purchase

• Required security level depending on parking location and duration
• Chain length needed to secure frame and wheel to common fixtures
• Preference for keyless combination vs. keyed lock systems
• Weight of an 8 mm steel chain relative to portability needs

Usage recommendations

For optimal security, use the chain in combination with a secondary lock (e.g., U-lock) when leaving a bicycle unattended for extended periods or in high-risk areas. Ensure the chain passes through the bike frame and rear wheel, and avoid leaving the lock on the ground where tools can be applied directly to the mechanism.