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Roughly as @Howard intimates, some "BB30" crank sets are really BB386 with padding to take up the space when used with a true BB30 shell. 30mm cups in a 68mm wide BSC threaded shell will have a width over the outside of the bearing races of 86mm, so you need that much between the inside faces of the crank bosses on your assembled crank set.
gbj_tester
Is there a way to go from BSA threads to BB30 cranks?