Race Face Aeffect Cinch Crankset: 30t Direct Mount 175mm Black, Bottom Bracket Not Included The crank arms are deep pocket net forged from 6066 aluminum to optimize stiffness Features our CINCH removable spider interface which offers the ability to convert between existing chainring standards while remaining flexible to future developments Uses the trusted 24mm EXI interface spindle, the Aeffect is a rock solid crankset for today's modern XC and trail rider