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@kowalski
Both Hubjub and Businesscycles have noted that Stronglight's claim that a 107mm BB gives correct chainline is wrong. Hubjub recommend a 103, byers a 111. The TA shares these issues.
I reckon the problem is that French kit is different to track "standard". (Whoda thunk it?) Will at Hubjub told me that the 42mm is more accurately Japanese track standard.
Depending whose specs you believe, the Mavic track hubs have a chainline of 44 or 46mm, which might explain why the Stronglight chainline is off on 42mm hubs.
The Ofmega spindle taper is proprietary, which doesn't help...