The race face turbine x type 6873mm bottom bracket is built for xcam riding with great durability the forged and cncd 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 cncd tool face to shave weight while still ensuring a positive engagement with standard shimano and park tools the race face turbine x tyre is interchangeabl