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Cheers, I think your right it would be pretty negligible. Overthinking a bit.
Interesting low trail 650b Pacer:
https://www.pedalroom.com/bike/surly-pacer-rando-35068#photo281817
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The difference between 38/42 is pretty negligibly - Might look odd though. Also would it really help the BB clearance? A bigger rear tire wouldn't really raise so much as pivot it slightly, right?
Just go 38/38. Plenty of people have done that on a pacer with success.