There were 14" wide rear campys for the race GpIV cars. I saw a set. That means they measured 15" wide - outer bead to outer bead
your marking of ET 37.5 is equal to 5.5" backspace on a 13" rim (it is actually -37.5 as they have a negative offset)
The ET 24.5 equals a 6.5" backspace if it applied to the 14" wide wheel. It makes no sense if applied to the 13" rim as they would be way to far inset.
I have a custom set of wheels that are 4.8" backspace (front) and 5.0" backspace (rear) and they are too far inward on GpIV fiberglass flares. They need to be moved our a good 3/4 inch both.
To compound the offset/backspacing some GT5's had wheel spacers fitted from the factory.
Julian
Julian
My GT5-S had spacers from the factory behind the original Campys. I mistakenly gave them to the person I sold those wheels to. I've had assurances that I'd get them back many times, but it's been 5 years already and I think at this point I'll have better luck waiting for the second coming of Christ.
Michael
Michael
Okay I took measurements and all tree different rims are ET 37,5. There is a 5mm spacer and it really looked right when assembled.