• But why use such a small ID shell if you plan to run a 30mm spindle when building a custom frame? Wouldn't a T47 shell be a better option?

  • Yes it would. There's just enough space in a T47 BB shell with an external bearing BB to squeeze a hydraulic brake line around the BB shell, depending on which make of BB you use. It's tight, but it's just possible.

    If they were using a lugged BB shell I could understand it as there are no lugged T47 shells. But for a full fillet-brazed BB shell it's a bit of an odd one.

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