Factory Reproduction Wheels offset/backspacing

[npritchard777]

I posted this up on *************.com but thought I should check in here too.

So I think I might not have the right rear wheels. I've been trying to figure out this offset / backspacing thing and found this website; http://www.joby.se/corvette/div/corvette_wheels/

It has this for the ZR-1
1990 (zr1)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Gatorbacks, P275/40ZR-17
rear 17"x11" 36mm (7.93" backspacing)

And this for the Grand Sport
1996 Grand Sport (coupé)
front 17"x9.5" 56mm (7.4" backspacing)
Goodyear Eagle GSC, P275/40ZR-17
rear 17"x11" 50mm (7.93" backspacing)

1996 Grand Sport (convert.)
front 17"x8.5" 56mm
Goodyear Eagle GSC, P255/40ZR-17
rear 17"x9.5" 56mm (7.4" backspacing)


So anyway, I went to measure the new wheels but couldn't find my tape measure anywhere (just moved and can't find anything). But I noticed the label on the box said these wheels were a 7.37" backspacing. I put a picture below.



I had specifically confirmed with the Factory Reproductions guy before I bought them that they were a 36mm offset. What I can't figure out is how the offset of 36mm works with a 7.37" backspacing. Of course, I'm a chump when it comes to wheel fitment.

I love the look of the wheel and would hate to send them back. So my question is, are these going to fit right or are they going to be sticking out?