Electric Bicycle

Material Composition Assumptions

Electric bicycles incorporate several resource-intensive materials that drive their carbon footprint. The aluminum frame serves as the primary structural component, typically weighing 2-3 kilograms and representing approximately 15% of total product weight. Lithium-ion batteries contain multiple critical minerals including lithium, cobalt, and nickel, with battery packs weighing 2.5-3.5 kilograms and comprising roughly 18% of product mass.

Steel and stainless steel components account for drivetrain parts, fasteners, and structural elements, contributing about 3-4 kilograms or 20% of weight. Copper and graphite materials within battery electrodes add specialized functionality while plastic housings protect electrical components and cables. Rubber tires complete the material profile, with the remaining mass distributed across smaller electronic components and motor assemblies.

Manufacturing Geography

Electric bicycle production concentrates heavily in China, which supplies approximately 85% of global electric bicycle manufacturing capacity. Chinese facilities benefit from established supply chains for both aluminum processing and lithium-ion battery production, creating manufacturing efficiencies but also exposure to carbon-intensive electricity grids.

The regional grid intensity of 555 gCO2/kWh significantly influences manufacturing emissions, particularly for energy-intensive processes like aluminum smelting and battery cell production. This grid composition relies substantially on coal-fired power generation, elevating the carbon footprint of upstream manufacturing activities compared to regions with cleaner electricity sources.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	555 gCO2/kWh	48	Baseline
European Union	275 gCO2/kWh	42	-12.5%
United States	400 gCO2/kWh	45	-6.3%
South Korea	450 gCO2/kWh	46	-4.2%
Taiwan	500 gCO2/kWh	47	-2.1%

Provenance Override Guidance

1. Submit aluminum frame manufacturing location with regional electricity grid carbon intensity documentation and smelting process energy consumption data.

2. Provide lithium-ion battery cell production facility location, capacity specifications, and material sourcing regions for lithium, cobalt, and nickel extraction.

3. Document motor and drivetrain component manufacturing origins with supplier-specific energy usage and transportation distance calculations.

4. Supply end-of-life battery recycling program participation rates and material recovery percentages for closure of material loops.

5. Provide actual electricity consumption measurements during manufacturing operations with time-stamped grid intensity data for production periods.

Methodology Notes

• The CCI score represents cradle-to-gate emissions covering material extraction, manufacturing, and distribution to retail locations, excluding operational use and end-of-life disposal.

• Scope 3 emissions dominate due to aluminum frame production and battery material processing, which occur upstream from final assembly facilities.

• The functional unit assumes a standard electric bicycle weighing approximately 20 kilograms with 400-500 watt-hour battery capacity.

• Transportation emissions reflect typical shipping distances from Asian manufacturing hubs to North American and European markets.

• Battery degradation and replacement cycles are excluded from the current methodology, though future versions may incorporate multi-year operational assessments.

• Charging infrastructure and electricity grid emissions during consumer use fall outside the current CCI boundary but represent significant lifecycle considerations.