Product detailsaffix1 1/8"colour black Material general Steel head set size 1 1/8" bearing ball bearing position of ball bearing external ball bearing cups height25 mmconvertability of bearing semi-cartridge ball bearing head set upper part SHIS EC 34/28,6 head set lower part EC 34/30 inner diameter28,6 mmouter diameter of the (upper) bearing shell (B1)34 mmouter diameter of the lower bearing shell (B2)34 mmcone seat on the fork30 mm