Calnago wrote:So why Pinarello still uses the Italian threads is beyond me. It doesn't matter, as the precession process is not relevant with todays BB designs, so functionally it doesn't present the issues that it did in the past,
Old post, but I'm pretty certain (but lack real world evidence of any issues) that this is incorrect. Even in a cartridge bottom bracket, the bearing races are essentially fixed to the cartridge (by means of being press fit into the cartridge) and thus subject it to precession loads. Even in instances where both threaded cups are not 'fixed' to the cartridge itself those cups are still designed to be a tight fit to the cartridge and would likely try to turn with the cartridge due to precession.
Sort-of modern outboard bearing cups share even more in common with old-timey cup and cone bottom brackets as the outer bearing races are press-fit into those cups providing a direct load path from the outer race to the cup. You don't want the outer bearing race spinning in the cup so it is always pressed in there quite tightly. As an aside, BB30 and PF30 designs where the bearings slip in are clearly poorly designed/manufactured as this is asking for issues; no bearing manufacturer would suggest designing a system like that where neither the inner or outer bearing race is tightly press fit onto a shaft or into a bore, respectively.
