The SLX FC-M7120 uses hollow-forged crankarms and Shimano’s 24mm Hollowtech II spindle for a 1×12 drivetrain. This is the 175mm version with a 55mm chainline and direct-mount chainring interface.
The listed hub compatibility is 141/148mm Boost, with a 178mm Q-factor. Check those dimensions alongside the frame and bottom-bracket requirements. The other crank lengths in the model range are alternatives, not additional lengths supplied with this SKU.






