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launchpadboi
snottyotter
I got number blind looking at that, but what gravel frame are you getting with a 73mm shell? Most outboard BBs end up at the same width whatever, with spacers compensating for the lack of width on as 68mm shell for MTBish cranks or just 68mm and no spacers allowed for road/grav cranks. I've not played often or in depth with the cranks you mentioned but a quick Google of the Middleburn suggest road only so no 73mm shell frames.