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Please use the drop down menu to choose your bearing size, measurements are in Millimetres and are IDxODxH (Internal Diameter x Outside Diameter x Height) Bearings listed cover most Road/Mountain Bike Headset sizes, 1" / 1 1/8"/ 1 1/4" / 1 1/2" / 1.5" / Tapered and also specific bearings for Giant Overdrive 2, Specialized and Cannondale Lefty. Seal Colour Varies with Bearing size If you are buying multiple bearings, add to basket what you require then you only have to check out once. ACB38H6.3 Size：27.2x38x6.3 45°/45° Typical use 1" internal and integrated Headset ACB38H6.5 Size ：27.15x38x6.5 36°/45° Typical use 1" internal and integrated Headset ACB39H6.5 Size ：30.15x39x6.5 45°/45° Typical use 1-1/8" internal and integrated Headset ACB418H6.3 Size ：30.2x41.8x6.3 45°/45° Typical use 1-1/8" internal and integrated Headset ACB418H6.5 Size ：30.15x41.8x6.5 45°/45° Typical use 1-1/8" internal and integrated Headset ACB418H7 Size ：30.15x41.8x7 45°/45° Typical use 1-1/8" internal and integrated Headset ACB418H7.7 Size ： 30.50x41.8x7.7 45°/45° Typical use 1-1/8" internal and integrated Headset ACB418H8 Size ：30.5x41.8x8 45°/45° Typical use 1-1/8" internal and integrated Headset ACB41H6.3 Size ：30.2x41x6.3 45°/45° Typical use 1-1/8" internal and integrated Headset ACB41H6.5 Size ：30.15x41x6.5 45°/45° Typical use 1-1/8" internal and integrated Headset ACB41H6.5K Size ：30.15x41x6.5 36°/45° Typical use 1-1/8" internal and integrated Headset ACB41H7 Size ：30.15x41x7 45°/45° Typical use 1-1/8" internal and integrated Headset ACB438H7 Size ：33.05x43.8x7 45°/45° Typical use 1-1/4" internal and integrated Headset ACB44H8 Size ：30.5x44x8 45°/45° Typical use 1-1/8" internal and integrated Headset ACB453H7.3 Size ： 35x45.3x7.3 45°/45° Typical use 1-1/4" internal and integrated Headset ACB458H6.5 Size ：36.8x45.8x6.5 45°/45° Typical use 1-1/4" internal and integrated Headset ACB45H7 Size ：33.5x45x7 45°/45° Typical use 1-1/4" internal and integrated Headset ACB468H7 Size ：34.1x46.8x7 45°/45° Typical use 1-1/4" internal and integrated Headset ACB469H7 Size ：34.1x46.9x7 45°/45° Typical use 1-1/4" internal and integrated Headset ACB46H7 Size ：34.1x46x7 45°/45° Typical use 1-1/4" internal and integrated Headset ACB47H8 Size ：35x47x8 45°/45° Typical use 1-1/4" internal and integrated Headset ACB49H7 Size ：37x49x7 45°/45° Typical use Specialized Roubaix Headset. Please check your measurements. ACB508H7 Size ： 40x50.8x7 45° /45° Typical use 1-1/2" internal and integrated Headset ACB518H8 Size ：40x51.8x8 45°/45° Typical use 1-1/2" internal and integrated Headset ACB518H8K Size ：40x51.8x8 36°/45° Typical use 1-1/2" internal and integrated Headset ACB519H8 Size ：40x51.9x8 45°/45° Typical use 1-1/2" internal and integrated Headset ACB51H6.5KK Size ： 40x51x6.5 36°/36° Typical use 1-1/2" internal and integrated Headset ACB52H6.5K Size ：40x52x6.5 36°/45° Typical use 1-1/2" internal and integrated Headset ACB52H7 Size ：40x52x7 45°/45° Typical use 1-1/2" internal and integrated Headset ACB52H8 Size ：40x52x8 45°/45° Typical use 1-1/2" internal and integrated Headset ACB568H6.5 Size ： 47.8x56.8x6.5 45°/45° Typical use Specialized Roubaix Headset.