Tiresize and wheel dimensions for stance improvement

[rginah1974]

It's the same car with different rims.

What works best on my MK-4 Roadster is the 17 X 9 and 18 X 10 combination.
That set up tucks the front tires in so I have no rubbing plus the diameter stagger yields a 25.08" front tire with a 26.18" rear tire.
It cheats the eye since the rear fender-wells are so much larger than the front fender-wells so both tires have the same tire sidewall height.
People can't believe that I've got two different rim diameters, but it works very well plus I've been told that they look really good.
For me finding the right offsets and tire combination was a paramount concern because form and function must go hand in hand.

Gray Rims
The 17 X 9 have a back spacing of 5.94 or 24 MM offset.
The 17 X 10 have a back spacing of 6.30 or 20 MM offset.

Black-Machined Rims
The 17 X 9 have a back spacing of 6.05" or 30 MM offset.
The 18 X 10 have a back spacing of 6.37" or 22 MM offset.

Hope This Helps!

Thanks a lot! Really helpful.

And yes, it's a good solution to have 2 different rim sizes as it will help give more feeling of power on the rear wheels. Some cars use this as well. Like the Chevrolet Corvette C4 (1984-1996) if I remember well.

Are your offset values positive or negative values (30mm or - 30mm, and 22mm or - 22mm)?

You think there is some more space in ET on the rear to widen a bit more?