Mountain Bike Shimano Bottom Bracket XTR M980 H/Tech II set 68/73mm
The XTR M980 Hollowtech II bottom bracket is Shimano's top end mountain bike BB. Light weight and sealed for maximum life, the XTR bottom bracket is a great upgrade to any MTB. Shimano Bottom Bracket XTR SM-BB93 HollowTech II set 68/73mm.