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Not need to be an engineer to see 0.1mm clearance have very little chance to spin freely
Depends on the application. If the shaft and bore are both accurately cylindrical, 50μm radial clearance is about right for this size if you want to treat it as a plain bearing with either hydrostatic or hydrodynamic lubrication.
Of course, a 1⅛" steerer, especially carbon fibre, is unlikely to be any of circular, straight or nominal size even without load, and it can get a long way from straight under load in comparison with a clearance that small.
gbj_tester
@Netakure
Not need to be an engineer to see 0.1mm clearance have very little chance to spin freely