I'm about to buy a Lapierre bike for the frame and fitting XT HTII to it, I keep having 2nd thoughts everytime these threads come up. There always seems to be talk of creaking and/or siezing BBs with BB30
Have two bikes with BB30 (road/hardtail; both C'dales) & so far no probs. Apparently the creaking is solvable by putting a bit of red Loctite (forget which number) on the bearing outer before pressing them home.
Lapierre don't use BB30 in any case; IIRC from a thread elsewhere on here (Edit: here) they use Shimano press-fit which is essentially a press-fit version of a normal external BB, with the bearings held in plastic collars.
Hollowtech II (Shimano cranks) isn't the same as Hollowgram (horrifically expensive Cannondale cranks).
There must be more options nowadays though.
Mainly FSA, though the 10sp SRAM XX/X0/X9 (don't know about X7) and road groupsets have BB30 options.
also BB30 helps simplify manufacture, no threads to cuts and machining concentric to bearings and crank axle not need to face BB shell
Partly true; BB30 does require pretty fine machining tolerances though. For that reason, I suspect that SRAM PF30 may actually become more common, as it uses the same cranks/tools but the bearings are in plastic collars like the Shimano press-fit system, meaning things don't have to be quite as precise.
Andy