Rim clearance with Viper calipers can really vary from rim to rim. The older factory stuff being the highest risk for interference. Newer stuff does seem to have some additional space built into them these days. I've had trouble with OEM era rallyes, magnums, and steelies. I've had not trouble with most new purpose built race wheels, a couple of billet styles, and even cast aluminum that is within 25 years old, all in 15" diameters.