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Would the additional width of the external BB pose issues with Q factor?
It won't make any difference. The Q factor is determined by the crank spindle length.
Is the frame genuine BB30 or PF30? If it's PF30 an alternative would be a screw-together PF30>GXP BB. I have a Praxis Converter PF30>GXP BB going spare if you're interested. They work well in my experience with no creakage.
Brommers
I have a caad12 frame with a BB30 bottom bracket.
I have an existing GXP crankset I’d like to fit.
I’ve seen you can buy an English adaptor, which apparently has the added benefit of reducing creaking. Would the additional width of the external BB pose issues with Q factor? Am I making this needlessly complicated? Cheers :)