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i was also thinking about putting a race on the carbon axle so that it fits snug wiht the bearings.
Do other sealed-bearing hubs have an axle like the carbon axle that you've shown above? I had a Hope hub a while back that definitely didn't, since you could knock the cups out by putting a drift in through the opposite axle hole.
If you have the carbon axle as shown then at least one cup will have to come out of it every time you want to change the bearings (assuming you'll put a flange on the inside of the hub body to retain the bearings). When you fit the bearings you'll then be trying to interference fit the cups into the carbon axle while pushing them into the bearings. You could get round this by fitting a Hirth coupling to the centre of the carbon axle, but I don't know whether that would work in terms of axial loadings on the bearings.
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ffm
@Isotropic
there should be a l;ip, but ive managed to choose parameters which hides it! good catch, ill fiddle with it til its back. i was also thinking about putting a race on the carbon axle so that it fits snug wiht the bearings.