1-1/8` upper, 1.5` bottom 45deg/45deg upper bearing - 1-1/8 36deg/45deg lower bearing - 1.5 For tapered fork steerer 1.5` to 1-1/8` Alloy 8mm top cover IS42/28.6|IS52/40 Black 91g 28.6 42/52 39.8 16.6 T:45?/45? B:36?/45? 1-1/8 to 1.5`UPC/EAN/GTIN: 400310063052