Old 05-24-20, 07:33 PM
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In general, it is possible to get a square taper crank to a lower q-factor. With Hollowtech II, GXP, BB30, or any external bearing system you have basically zero adjustment.

Here is a list of various q-factors. I measured these without extreme care for my own reference, so take them with a grain of salt. You can surely find other lists online.

Stronglight square taper double on Peugeot, unknown bottom bracket length: 141mm
Dura Ace 7400 double, 110mm bottom bracket: 141mm
Rene Herse double, 110mm bottom bracket: 143mm
Shimano 600 6207 double, 110mm bottom bracket: 145mm
Shimano Sport LX double, 107mm bottom bracket: 148mm

Dura Ace 7800 double, Hollowtech II: 148mm
Ultegra 6600 triple, Hollowtech II: 157mm
Sora triple, Hollowtech II: 162mm

Shimano MTB triple, unknown model, Hollowtech II: 186mm
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