M30 CranksDescription The M30 is part of their 30mm spindle line of cranks which also includes the A30, R30 and G30 models. The M stands for mountain and the 30 is for the 30mm spindle. The best way to describe this model is, Its a mountain bike crank. Simple. Check out the table here and compare the specs of all four crank combinations to help decide which model would best suit your needs. Note: Spindle, crank bolts, extractors, adjusting collar, and chairing
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