Heavy Duty MTB ＞ Tubular Crankarm ＞ Heavy–Duty MTB Cr–Mo● Chainwheel: CR–MO 170,175mm● Crankarm: Alloy/Steel Option● Spindle: CR–MO spindle 24mm● BB: FEuro,Mid,BB Shell Option● Chainline: 50mm● 19mm–8T Spindle