My girlfriend has an early 90s Razesa that I'd like to change the rear sprockets on. It's a standard 39/53 double with a corncob (11/17) in the rear, attached to a SunTour Cyclone threaded hub. Components are early 90s Campy Athena, including downtube indexed shifters. She's not time trialing, so I'd like to widen the gear ratio to giver her something more suited to her riding style. It appears that Shimanos were essentially the industry standard, but would they work with the Campy shifters?