BSA Road and mtb bottoms bracket shells are different widths.
Nah, most are 68mm but some MTBs are 73, might also have extra for ISCG mounts. Just install the cranks with an MTB BB and the correct spacers for a 68mm shell, which is 5mm DS and 2.5mm NDS.
@snottyotter started
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BSA Road and mtb bottoms bracket shells are different widths.