Part of the popular Turbine Crank series from Race Face, Evolve chain rings have been upgraded with extensive CNC machining for shifting accuracy. An optimized chain-to-ring interface ensures they shift flawlessly, even under load.
- Outer and middle chain rings are 7075-T6 aluminum for increased wear resistance and impact strength.
- Granny ring is made from high strength, heat-treated chromoly steel with a satin chrome-plated finish.
Bolt circle diameter
Bolt circle diameter (BCD): the diameter of an imaginary circle that intersects the centre of each chainring bolt.