GERDA CONTRA 900/6V Bike Chain Lock 90cm Hardened Steel 6mm Round Black Symmetrical Key

Product Overview

The GERDA CONTRA 900/6V bike chain lock offers premium protection with a 90 cm hardened steel chain, suited for securing bicycles in residential or urban environments. Its 6 mm round-section links provide durability and resistance against cutting, and the textile cover prevents scratches on bicycle frames. The unit features a round lock body protected by a dust cap, ensuring reliable operation in outdoor conditions susceptible to dust and mud.

A distinctive feature is the symmetrical key system, enabling key insertion and turning in any orientation, which facilitates convenient access even in low-light or awkward settings. This reduces lock access errors and supports quick locking and unlocking for fleet operators, bike shops, or shared mobility services requiring fast turnaround and reliable security for standard-use bikes. The GERDA CONTRA 900/6V is particularly suited for bulk procurement where cost-effective, mid-level bike security is necessary.

Key Features

• Premium Protection ? Gerda Class rating ensures higher security for urban and residential scenarios


• Hardened steel links ? 6 mm round-section chain resists cutting and tampering


• Textile sleeve ? prevents scratching on bicycle frame and dampens impacts


• Symmetrical key ? unlocks easily in any position, convenient for quick access and night use


• Dust cap ? shields lock cylinder from dust, mud, and moisture, prolonging lifespan


• Plastic-coated lock body ? protects paintwork and reduces accidental damage


• Chain length 90 cm ? flexible attachment through frame and wheel to fixed objects

Technical Specifications

• Chain Length: 90 cm


• Link Diameter: 6 mm


• Section Shape: Round


• Sleeve Material: Textile cover


• Lock Body Shape: Round


• Lock Body Coating: Plastic


• Key Type: Symmetrical (removable from open and closed positions)


• Protection Class: Gerda Premium

Applications

Appropriate for securing standard bicycles in residential complexes, public bike racks, retail bike stores, and shared mobility fleets. Suitable for short-term parking and protection of entry-level or mid-range bikes in urban or campus settings. Designed for use on seat tubes, handlebars, or within saddlebags. Recommended for bulk supply to bike rental outlets, OEM inclusion, or general retail security assortment.

Packaging & Shipping

Standard export packaging. Each unit is individually boxed and includes the chain lock, textile sleeve, key, and installation instructions.