Cane creek cartridge bearings s2s3zs2is2 these bearings also fit a huge range of other cartridge bearing headsets bearing info mh po3k 41 x 302 x 65 35x45 deg internal bearing diameter is 30mm external bearing diameter is 41mm fits standard 1 18 cartridge bearing headsets sealed cartridge bearings pair top and bottom race buy cane creek components from chain reaction cycles the worlds largest online bike store