RaceFace Small Crank Boots for Aluminum Bicycle Cranks - Pair Fits from Race Face: Turbine, Atlas, Evolve and Ride Cranks Fits from Shimano: XT, SLX, Deore Cranks Fits from SRAM: X1 (Alloy), X9, X7, X5, S1400, S1000, S800 Cranks Race Face Crank Boot protects the crank arm from rocks and debris