GERDA CONTRA LINE COMBO 900/6C Bike Chain Lock 5-Digit Combination Black 90cm

Product Overview

The GERDA CONTRA LINE COMBO 900/6C is a combination bike lock featuring a rigid steel chain with a five-digit programmable code. It is designed for everyday use by cyclists, delivery personnel, or owners of child strollers, offering quick security for bicycles and small vehicles during short stops in secure environments, such as residential complexes or office premises. The lock consists of 6 mm diameter steel links, measures 90 cm in length, and is protected by a textile sleeve to prevent scratches on bikes.

The key differentiator of this product is the individually settable five-digit combination mechanism, which eliminates the need for managing keys and prevents operational delays due to lost or misplaced keys?an advantage for fleet managers or commercial bicycle sharing operators. Its 90 cm length and flexible mounting options allow it to be looped around frames, wheels, or to fixed urban infrastructure, making it a practical option for bulk procurement by schools, campus facilities, or rental fleets where management simplicity is a priority.

Key Features

• Five-digit combination lock ? individually programmable for secure keyless operation


• 6 mm round steel chain ? ensures basic resistance to cutting and tampering


• Textile sleeve protection ? prevents cosmetic damage and scratches to the bicycle frame


• 90 cm chain length ? convenient for locking frame and rear wheel to fixed objects


• Gerda Class: Standard Protection ? suitable for low-to-moderate risk environments and short-term security needs


• Versatile mounting ? can be carried on handlebar, seat tube, or inside a bag

Technical Specifications

• Chain Link Diameter: 6 mm


• Chain Length: 900 mm


• Lock Type: 5-digit combination, resettable


• Material: Steel (chain), textile (sleeve)


• Color: Black


• Protection Class: Gerda Standard Protection


• Body Type: Round

Applications

Used for securing bicycles, child strollers, and similar equipment in urban, campus, or residential settings where short-term protection is needed. Intended for scenarios such as locking bikes during quick errands, at school or workplace bike racks, or for shared fleet management in low-risk areas. Not recommended for high-value equipment or overnight outdoor storage.

Packaging & Shipping

Standard export packaging. Each unit includes the combination lock with textile-covered chain and a multilingual instruction manual for code setup and use.