The blue rear sprocket provides you with the following advantages:
• Made of high-strength 7075-T6 aluminum, the strongest aluminum in the world
• Originally developed for the aircraft industry and then adopted by the best rear sprocket manufacturers
• Cleaner, straighter and smoother chain travel, because it is ground precisely flatto 0.002 mm
• No vibration - therefore maximum efficiency of power transfer
• All these features mean slow wear and extreme durability over the long-term
- Anodized blue, with a permanent, organic environmentally friendly colorant.
WARNING: Cancer and Reproductive Harm https://www.p65warnings.ca.gov