FCM912_z_C FC_h_M912_z_ XTR crank set without ring, 52 mm chain line, 12_h_speed, 17_z_ mm Shimano XTR Grey _fsla_ Black Single 4524667879688 Parts 4524667879688 Shimano Latest Series Shimano XTR FCM912_z_1 fc fcm 912_z_ fc_fsla_m912_z