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gbj_tester in reply to @Rodolfo

I seemed to remember that shoving a 30mm axle in a threaded frame was pushing it, and the corresponding bearings becoming too small.

You're not putting the bearings inside the shell, they're in overhanging cups the same as HT2/GXP/UltraTorque, with an 86mm long axle. There's enough room in a 1.37" BSC threaded shell for the cup spigots and the axle.
The thing which doesn't work is trying to put a 68mm long 30mm axle into a 68mm×1.37" shell, because that only leaves a radial clearance between the shell thread ID and the axle OD of <2mm to accommodate the cups and bearings.

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PhilDAS in reply to @gbj_tester

I think the thing @Rodolfo is referring to is the fact that the BB manufacturers tried to keep the cups within the restraints of fitting in a regular HT2 tool so the bearings got very thin when they had the same OD but larger IDs.

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gbj_tester in reply to @PhilDAS

BB manufacturers tried to keep the cups within the restraints of fitting in a regular HT2

Stuffing a 30mm axle into the space allowed by the OG HT2/GXP/UT cup tool isn't really any worse than putting a 24mm axle in the newer "small tool" HT2 cups, or for that matter a 22mm Octalink or ISIS axle and bearings inside a 1.37" threaded shell. There are several reasons why using full size BB30 bearings is slightly better, but none of the above was terminally horrible.

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