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 flat to 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