The Race Face Turbine X-Type 68/73mm Bottom Bracket is built for XC/AM riding with great durability. The forged and CNC’d aluminium cups have a fully serviceable custom 6805 16 ball retainer bearings in them with a Titanium coated races that help keep the dirt and water out. Ensuring unparalleled corrosion resistance. The cups have custom CNC’d tool face to shave weight while still ensuring a positive engagement with standard Shimano and Park tools. The Race Face Turbine X-Tyre is interchangeable with some Shimano and FSA external mountain bike cranks. The perfect upgrade or something different to put on your bike.