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True, although the pf solution for bb's was really badly thought out. You might have much higher torque loading or rpms on an automotive press fit bearing, but the twisting loads acting on the BB area of the bicycle, with the (quite high) risk of deformation post welding due to insufficient wall thicknesses meant that it was always a bit hit and miss. Rob @hoops has a pf30 and has no problems, others have had much less luck. Fortunately no one has mentioned bb30!
(Looks like shand? If so whatever the guvnor says will be more than fine anyway 😉)
deleted
Skant
Hey all, apologies for the gap in posts. The ball is finally starting to roll on this so will update as the project progresses.
RE: the BB discussion - I know threaded bb's work well. BSA is tried and tested and t47 makes a lot of sense with oversize tubing, the compound mitres get silly with OS tubes wrapping round a BSA shell however I don't feel the need to test out a T47 bb for myself. Can't see there would be any I ssues with a threaded interface and space for huge bearings.
If you look to automotive or industrial applications, where bearings see higher loads at higher speeds in comparable/worse conditions than cycling, bearings will be press fit. I'm curious to see if/where/how problems could arise with a quality shell and proper prep and installation.