Shimano's Deore XT M8120 12-Speed Single Crankset uses an entirely new construction, with exchangeable direct mount chainrings matched to their proven Hollowtech 2 bottom brackets (sold separately) to create a lightweight, strong and great value crankset.Hollow-forged crank arms are incredibly strong, lightweight and deliver maximum power transferExchangeable direct mount chainring design can be swapped between single/double combinations55mm chain line for use with frames with Boost 148mm rear axle spacingChainring not included sold separately (image for illustration purposes only)Bottom bracket sold separatelyThe Deore XT M8120 uses Shimano's long-standing Hollowtech II construction, giving you a crankset that is lightweight, stiff and incredibly durable. They are also a breeze to install and maintain. The versatile direct mount chainring design means you can quickly and easily swap between double or single chainring combinations, boosting the cranksets versatility. This version is