1970-1981 Camaros and Firebirds
15-inch: 15x8 with 4-1/2-inch back-spacing up front. Camaros use 15x9 with 5-inch backspacing in the rear; Firebirds can use 15x10 with 51/8-inch backspacing in the rear. Use tires with an aspect ratio of 55 or less with widths of 255 front, 285 rear. You’ll need to remove the outer rear seatbelt anchor/retractor and flatten the bulge in the rear wheelwell with a hammer.
16-inch: Same as for the 15-inch recommendations but with a tire aspect ratio of 50 or less. There may be lower-control-arm contact with some steering gears.
17-inch: 17x91/2 with 6-inch back-spacing up front; you’ll need to modify the steering stops or the lower control arm to prevent contact. Camaros use 17x10 rears, Firebirds use 17x11, both with 6-inch backspacing. As mentioned in the 15-inch recommendations, you’ll need to remove the seatbelt retractor and bulge. Use tires with an aspect ratio of 40 or less with widths of 275 front, 295-315 rear. This is a really tight fit, so success will vary
car-to-car.
18-inch: Use the same recommendations as for the 17-inch rims, but the tires need an aspect ratio of 30.
http://oldsmobility.com/fitting-wheels.htm
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