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@snottyotter
Pretty sure the BB will be fine, no 2.5mm spacers for road cranks in a 68mm shell, no spacers for MTB cranks in a 73mm shell or 1 spacer each side for MTB cranks in 68mm shell. Cranks will be no good though as they need a 68mm shell and you may as well get whatever BB suits the new cranks you want rather than trying to match to gxp.