CeramicSpeed Bottom Bracket, which converts English-threaded frames with external bearing cups, originally made for 24mm axles, to fit BB30 cranksets with 30mm axle. Note that not all BB30 cranks will work with this system. Examples of compatibility include Rotor 3D+, Rotor 3DF and Zipp. Does not accommodate Campagnolo Over-Torque, THM and FSA386. Suitable for Road and MTB, with standard or coated CeramicSpeed Bearings, in either red or black cups. Step up to a new and transformed riding experience with the CeramicSpeed BB BSA30 Bottom Bracket. Stiffness, low friction and unmatched lifetime are encompassed within the excellent reliability delivered by CeramicSpeed Bottom Brackets. Did you know that this product has a lifetime warranty? That’s right: as of September 1, 2021, all CeramicSpeed ‘Coated’ products and OSPW cages (purchased after January 1, 2021) are covered for life -- that’s how confident CeramicSpeed are in the durability of their products. You can check out the full terms and conditions here. Specifications Frame fit: BSA Thread Colour: Red Axle Diameter: 30mm (BB30) Width: 68/73 What's In The Box? Bottom Bracket Dust cover Grease Sticker Sheet2