Shimano BB-MT800 XT 68-73mm External Bottom Bracket - 24mm - BSA Threaded - 68-73mm PLP|EMTB Optimised With the popularity of carbon

With the popularity of carbon and other really expensive components

The T-Ratchet uses interchangeable magnetic components to convert from screwdriver to ratchet

most people will still probably need to trim them down a bit

Suitable for all speed chains

1-1/8" and 1-1/4" headsets

Shimano BB-MT800 XT 68-73mm External Bottom Bracket - 24mm - BSA Threaded - 68-73mm PLP|EMTB Optimised With the popularity of carbonPremium XT bottom bracket keeps the elements out and your cranks spinning freely. The XT BB MT800 uses smaller ball bearings for smooth operation while durable seals keep the dirt and grime out. The BB MT800 is compatible with Shimano Hollowtech II cranks and 68 73mm BB shells. Installation: The smaller diameter 16 notch 41mm cups on this BB require the Cleanskin 4 in 1 BB Tool, or the Park BBT 59. 2 41mm OD External BB Tool for installation. If you