Bicycle Cable Lock

Material Composition Assumptions

A typical bicycle cable lock consists of approximately 1000 grams total weight distributed across several key components. The galvanized steel cable represents the largest material fraction at roughly 800 grams or 80% of total mass, providing the primary security function through its cut-resistant properties. The plastic coating layer, typically made from polyvinyl chloride or polyester materials, adds approximately 120 grams or 12% to protect the cable from weather exposure and prevent surface scratching. The cylindrical lock mechanism housing, constructed from brass or hardened steel alloys, contributes around 60 grams or 6% while containing the locking mechanism and key interface. Supporting materials include zinc alloy key blanks at 15 grams and cardboard packaging materials at 5 grams, representing the remaining 2% of total product mass.

Manufacturing Geography

Bicycle cable lock production concentrates primarily in China due to established steel processing infrastructure and integrated supply chains serving the global cycling accessories market. Chinese manufacturing facilities benefit from proximity to raw steel suppliers and specialized metal finishing operations, enabling cost-effective production of security-grade cable components. However, the reliance on coal-intensive electricity generation results in higher carbon intensity for manufacturing processes, with the national grid averaging 555 gCO2 per kilowatt-hour. This elevated grid intensity particularly impacts energy-intensive operations such as steel wire drawing, galvanization treatments, and plastic extrusion for cable coatings.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	555 gCO2/kWh	3.2	Baseline
European Union	275 gCO2/kWh	2.4	-25%
United States	385 gCO2/kWh	2.8	-13%
India	645 gCO2/kWh	3.6	+13%
South Korea	425 gCO2/kWh	2.9	-9%

Provenance Override Guidance

1. Steel mill certificates documenting the percentage of recycled content in cable wire production, as recycled steel reduces emissions by up to 1.8 tonnes CO2 per tonne compared to primary steel routes.

2. Manufacturing facility electricity consumption records with renewable energy procurement documentation, enabling adjustment from default grid intensity assumptions for cable drawing and coating processes.

3. Transportation manifests showing shipping distances and modal split between ocean freight and trucking for distribution to regional markets, as logistics represent approximately 8% of total product emissions.

4. Plastic coating supplier specifications detailing resin type and bio-based content percentages, since coating materials contribute over 20% of the carbon footprint through petrochemical feedstock requirements.

5. End-of-life material recovery documentation for steel cable recycling programs, which can provide carbon credit offsets of up to 2% against total product emissions.

Methodology Notes

• The Climate Cost Index score represents cradle-to-gate emissions for a standard 1000-gram bicycle cable lock including materials extraction, manufacturing, and packaging through retail distribution
• Scope 3 emissions dominate at 50% due to steel production’s carbon-intensive mining and smelting operations, while Scope 2 electricity consumption accounts for 35% reflecting energy-intensive cable processing
• The functional unit assumes a medium-security cable lock with 10mm diameter galvanized steel cable and integrated cylinder lock mechanism
• Exclusions include retail operations, consumer transportation, and maintenance activities during the use phase, as cable locks are considered durable goods with minimal operational emissions
• Data gaps exist for specialized coating formulations and regional variations in steel recycling infrastructure, contributing to medium confidence levels in the assessment