The SHIMANO XTR FC-M9130-1 crank features an entirely new construction, using direct mount chainrings, special gear tooth profile for improved chain retention, and a narrow 171 mm Q-factor. The FC-M9130-1 uses a 56.5 mm chain line and can be converted between 1x and 2x, with 30, 32 and 34T chainrings. On offer are 165, 170, and 175 mm crank arms.