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@Overuser155208
Bought this IS42 standard https://www.planetx.co.uk/products/selcof-integrated-cartridge-bearing-headset-for-straight-1-1-8th-fork-steerer these bearings are CBB418 41.8 outer, 30.2 inner and 45 degrees edges and 7mm depth. This is outside of the is42 spec. A quick google of the bearing reference doesn't give the same dimensions as these selcof and none of the other references match IS42 standard ffs. What is the point of a standard if it isn't followed by other bearings.
Tho I am going to lift the seals and overfill the bearings with waterproof marine bearing grease. Believe that will add extra waterproof properties.