The new XTR M9100 series offers the most versatile groupset for cross-country, enduro and marathon racing. Designed to meet the needs of mountain bike racing at the highest level with exceptional experience and performance. The Shimano FC-M9120-1 (Q-Factor 168mm) crankset features an all-new design compatible with Direct Mount Shimano chainrings from 30 to 38 teeth and a double version. Details: Model: FC-M9120-1. Compatible with 11/12 speeds. Smoother transmission even on rough terrain. Lighter, stiffer model, easy to replace thanks to direct mounting and 1-key release. Q-Factor: 168mm. Cranks only (without chainring) Assembly/disassembly tool included. Chain length: 52 mm Weight 466g.