SR-71 SS

iTrader: (2)

so I am working on a 69 opel gt to swap in a LS motor and bring it back to street legal
https://ls1tech.com/forums/conversio...9-opel-gt.html

As part of this process I am selling the slicks/skinnies currently a 15x12 or 13 rear and 15x4.5 fronts and would like to put a 15x10 rim out back and probably a 15x8 up front.

What measurements do I need to take off the old rims, or the vehicle to center the smaller rims in the wheel wells? I have read the stickies and didnt see how. any help would be most appreciated. Thank you.

VinR1

iTrader: (17)

Do you want the new wheels centered in the wheel wells or to sit the same way in relation to the fenders as the old wheels?

SR-71 SS

iTrader: (2)

Same relation where the outside edge lines up with the fender

VinR1

iTrader: (17)

Easy, see pic below to determine backspacing. For your rears, subtract however much narrower you want to go... fronts, add the extra width. For example, a 12" wide wheel with a 6" backspacing will set in relation to the outer edge of the fenders as a 10" wide wheel with a 4" backspacing

SR-71 SS

iTrader: (2)

got it. Thanks for the picture, makes it easy to visualize.