Maximum Wheel and Tire Sizes

Short answer: On an unaltered 1967–69, the biggest practical tire is about 235/60-15 on 8″ wheels (members report 245 on an 8″ being too big). For more aggressive fitments, Car Craft (March 2000) published maximums for 1967–69 Camaro/Firebird:

15-inch: 15×8 with 4.5″ backspacing front and rear. With some tires the rear shocks must be mounted inboard; then some 9″ wheels work with 5.5″ backspacing.

16-inch: 16×8 with 4.5″ backspacing front and rear (rear shocks relocated inboard). Use aspect ratio 50 or less, section widths 245–250.

17-inch: 17×9 with 5.5″ backspacing front and rear. Possible lower-control-arm contact with some steering gears. Aspect ratio 40 or less, 245–255.

18-inch: 18×9 with 5.5″ backspacing front and rear. Aspect ratio 35 or less, 245–255 front and 275 rear.

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