・Superior chain retention"Special mountain bike chainring tooth profile improves chain engagement and retention-DYNAMIC CHAIN ENGAGEMENT+ (dynamic chain engagement)・Stiff, lightweight design for aggressive trail riding"Hollow" forged crank for maximized power transfer while limiting weight-HOLLOWTECH II・Q-factor: 172 mm・Chain line: 52 mm・Weight: 608 g (28 dts), 622 g (30 dts), 620 g (32 dts), 633 g (34 dts), 651 g (36 dts)FeaturesThe SHIMANO DEORE XT FC-M8100-1 crankset features an all-new construction, direct-mount chainrings, a special tooth profile for better chain retention and a 172mm Q-Factor.