Shimano xtr fcm980 10 speed double chainringsride shimano and enjoy the benefits of their no compromise attitude shimano use the best materials for unrivalled performance genuine shimano replacement chainring features10 speed dyna sys compatiblemiddle ring carbontitaniumouter ring aluminumah type rings are for m980 doublea 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