Shimano deore fcm590 10 speed triple chainringgenuine shimano replacement parts for use with the shimano deore fcm590 10 speed crankset features bolt circle diameter 64mm compatibility10 speed dyna sys chainline 50mma 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products buy shimano components from chain reaction cycles the worlds largest online bike store