Bicycle Tire (pair)

Material Composition Assumptions

A typical bicycle tire pair weighing approximately 1.25 kilograms consists of several key materials with distinct environmental footprints. Natural rubber comprises the largest portion at 280 grams, representing roughly twenty-three percent of the total weight and serving as the primary elastomer for tire flexibility. Synthetic rubber accounts for 300 grams or twenty-four percent, providing durability and specific performance characteristics that complement the natural rubber base.

Carbon black constitutes 240 grams or nineteen percent of the tire weight, functioning as a reinforcing filler that significantly impacts the carbon footprint due to its energy-intensive production process. Steel wire reinforcement adds 140 grams at eleven percent, providing structural integrity to the tire bead and sidewall areas. Silica and other mineral fillers contribute 125 grams representing ten percent of the weight, while textiles and chemical additives make up the remaining 100 grams at eight percent of the total composition.

Manufacturing Geography

The majority of bicycle tire production occurs in Asian manufacturing centers, particularly in China, Taiwan, and Thailand, where established rubber processing infrastructure and supply chain proximity create operational efficiencies. These regions benefit from direct access to natural rubber plantations in Southeast Asia and well-developed synthetic rubber production facilities that reduce transportation emissions for raw materials.

The average grid intensity across major Asian manufacturing hubs reaches approximately 650 kilograms of carbon dioxide equivalent per megawatt-hour, reflecting the continued reliance on coal-fired power generation in many tire production facilities. This grid intensity directly influences the scope two emissions associated with tire manufacturing processes, particularly during energy-intensive vulcanization and curing operations that require sustained high temperatures.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
Asia (China/Thailand)	650 kgCO2e/MWh	13.0 kg CO2e	Baseline
Europe (Germany)	350 kgCO2e/MWh	11.8 kg CO2e	-9%
North America (USA)	400 kgCO2e/MWh	12.2 kg CO2e	-6%
Europe (Recycled Materials)	350 kgCO2e/MWh	7.7 kg CO2e	-41%
Asia (Local Distribution)	650 kgCO2e/MWh	11.4 kg CO2e	-12%

Provenance Override Guidance

1. Submit detailed material composition data including percentages of recycled content, natural versus synthetic rubber ratios, and alternative filler materials that may reduce carbon black dependency.

2. Provide manufacturing facility energy consumption records with specific grid intensity data or renewable energy procurement documentation that demonstrates lower emissions than regional averages.

3. Document transportation methods and distances from raw material sources to manufacturing facilities, including shipping modes and routing efficiency improvements.

4. Supply end-of-life program details including tire collection systems, recycling partnerships, and material recovery rates that exceed standard disposal assumptions.

5. Present third-party verified lifecycle assessment reports following international standards that demonstrate product-specific emissions reductions through design or process innovations.

Methodology Notes

• The CCI score represents cradle-to-grave emissions for a pair of standard bicycle tires including raw material extraction, manufacturing, distribution, use phase wear, and end-of-life treatment across a typical service life.

• Scope three emissions dominate at eighty percent due to the carbon-intensive nature of rubber and carbon black production, while scope two emissions from manufacturing energy use contribute fifteen percent under Asian grid conditions.

• The functional unit assumes standard road bicycle tires with conventional tread compounds and steel bead construction, excluding specialized racing or mountain bike variants that may have different material compositions.

• Use phase emissions from tire wear and microplastic generation are excluded as they represent less than one percent of total lifecycle impacts and vary significantly based on riding conditions and maintenance practices.

• Data gaps exist for emerging sustainable materials and regional recycling infrastructure variations that could substantially alter emissions profiles in specific supply chain configurations.