I've got a Racing T triple that came 50/40/30. Sure there are no rings smaller than 53? Anyway, you would probably be okay with 53/39/30, with a modern triple FD. The only possible issue is the 53 forces the FD higher, so it's more work to shift the chain from the 30 to the 39. Do you have a long cage RD as well? I think most modern road triples are 50/39/30 because of chain wrap issues. The road triple RDs don't wrap as much chain as a MTB derailleur. Or maybe there's another reason I'm not aware of.