Stock 57 wheels are 14"x5". The backspace is 3 9/16". Off set is how far the center line of the wheel is from the mounting surface. So a 5" wheel is actually 6" wide, rim edge to rim edge. If it had a 3" backspace, then the offset on that wheel would be zero, because the mounting surface is centered.
1957 Belair 2Dr Hdtp, 58,000 original miles, original never rebuilt 283 engine, 245hp, Dual Fours, Tremec TKO 600 5-speed, 3.70 gears, AACA Senior in 1985
1955 Belair Convt
1956 210 2dr Sdn
1957 Belair 2Dr Hdtp
I have a perfect set of 15" 80-92 Cadillac Brougham wire wheels with a 5x5 bolt pattern. I may just do some math and see if those with adapters will work.
They are 15 inch wheels with a 7 inch width and a 4 1/2 inch offset (from the flat part of the back of the hub to the inner edge of the wheel)
Wow. A stock 15x7 GM disc wheel with 4.5" backspace on a 5x4.75 bolt pattern. Could this be true?!?!?
If that's the case, then wheels that fit that era of Caddy are the ticket for mounting a 225 tire on a car that has Heidt lowering spindles. According to "the calc", that wheel would even allow a 235 tire up front on a stock set of brakes.
Is this too good to be true? I'd really appreciate it if you could tell me the exact model Caddy and the range of years that used that size rim.