The 37-inch Rockers for the 15-inch rims were Load Range C, while the tires for the 17-inch rims were Load Range E. So in addition to having an inch less sidewall they also have a stiffer carcass.

There are also 15-, 16-, 17- and 18-inch chrome or silver powdercoated Rally style wheels available for those who want to run modern performance tires but keep the stock theme.

15-Inch Vs. 16-Inch Wheels The days of 15-inch wheels on road cars are pretty much over, but there are a couple of areas in car culture you'll find them.

For example, a P225/45R15 tire has a 15-inch wheel size with 225 mm of tread width, and the sidewall is 45 percent of tread width, or 101 mm.

With either 12.19-inch kit you can have big-brake stopping power and fitment with most 15-inch wheels. Be sure to check Wilwood's on-line wheel clearance diagram for wheel fitment.