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not sure how they’re different.
Different threads, depending on the wall thickness of the axle. Can't remember the actual numbers but 6600/6650 is the normal road size so any generation 105/Ultegra/DA compatible parts will work. Look in my 464 thread for #tester_approved aluminium ones
gbj_tester
@AlexD
I’m going to whack some new old ultegra (6650) cranks on my surly, but I’m missing the preload bolt. I know there’s a couple of different types but I’m not sure how they’re different. If I want a non-shimano plastic one, what should I be looking for? Can’t seem to find a compatible one.