Ok I own two very nice 3rd gen Fbody Z/28's. the first is an 87. It has the stock suspension under it. I plan to swap lt1 backing plates and calipers from the drums on the rear. I'm looking at 15x9 rears and 15x8 fronts Weld RTS wheels. I want them to sit perfect or just barely behind the fender/quarter rolls. The 92 looking at 17x9.5 and 17x11 and looking for the same stance. Can someone give me definitive answers as to what I should go with as far as backspacing? Going with medium pad RTS's so I can upgrade brakes later if so desired. Please don't flame me I did a search but the answers are not coming. At the very least link any known threads to help me and I will go research from there. As always any help is much appreciated. Thank you. Dale.

 

"1982-1992 Camaros and Firebirds
15-inch: 15x8 with 4-1/2-inch back-spacing front and rear. Use tires with an aspect ratio of 55 or less with a section width of 255.
16-inch: 16x8 with 4-1/2-inch back-spacing front, 51/8 backspacing rear. Use tires with an aspect ratio of 55 or less and a section width of 255.
17-inch: 17x9 with 5-1/2-inch back-spacing front and rear. Use tires with an aspect ratio of 40 or less with section widths of 255 front, 275 rear.
18-inch: 18x9-1/2 with 5-1/2-inch back-spacing front, 18x10 with 6-inch backspacing rear. Use tires with an aspect ratio of 35 or less with section widths of 275 front, 275-295 rear."

 

4.5 front and 5.25 rear will work well.