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@dglshrn
My topstone carbon 2019 headset bearings have had it (who knew a load of sand and mud were no good for bearings?)
I think the part is K35010 1-1/8-1.5 Int Hdset w/ 36 Deg CR 25/5 TC
Can anyone confirm and point me in the direction of some bog standard bearings that will fit? I'm struggling.