Headset Cartridge Bearing Enduro ACB 4545 1125 BO 1-1/8" 30.5x41.8x8 mm IS42 Campagnolo Hiddenset Standard 45° Inner/45° Outer Black Oxide
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If you are not sure what headset standard your bicycle has, please reference this guide:
https://www.parktool.com/en-us/blog/repair-help/headset-standards
Not all IS42 headset bearings are created equal. Some have 2 45° angles while others have a 36° inner and 45° outer. Some are 8 mm thick while others are 6.5 mm thick. Measure your old bearing carefully.
