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I've been asking around, doing calculations, etc. all about trying to fit 275/50/15s under the rear quarters of my '67 with a narrower Versailles rear. Why 275/50/15s? They are about the same diameter as 225/60/15s on 15x7 that I have planned for the front according to 1010tires calculator (great tool BTW):

Front Section Width: 8.85 in
Rear Section Width: 10.82 in
Front Rim Width Range: 6 - 8 in
Rear Rim Width Range: 7.5 - 9.5 in
Front Overall Diameter: 25.62 in
Rear Overall Diameter: 25.82 in

My front 15x7s are 4.25" backspacing, my rear 15x8s are 4.75".

Anybody tried this with a setup like mine?
 

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i have 275/50-15's on the back of my 69 coupe mounted on 15x8 wheels, not sure of the backspacing though. with the stock 69 rearend i had to roll the lips in the rear and i only get minimal rubbing at full suspension travel with worn out stock springs. i had calculated at one time that i could with a 295/50-15 on either a 15x8 with my versailles rear that is sitting in the garage using the same wheels i currently have. now the 69 has a little more room for rear tires than the 67 but if a 295/50 will fit i see no problem getting a 275/50 to fit in a 67. i know someone on stangnet has a 67 fastback with 275/40-17's and he has no problems at all with his
 

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Just as a side bit... so long as you have your springs in the same place, it doesnt matter what rearend you have. It's all in the backspacing.
 

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Just as a side bit... so long as you have your springs in the same place, it doesnt matter what rearend you have. It's all in the backspacing.
yep that's true, but with a narrower rear end you might have more available wheel options without having to go to a custom wheel
 

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The Versailles rear will not accept factory 67 wheels, it will accept Magnum 500's though. The center section where the wheel slips over the lugs is smaller in diameter than the stock 67 rear. Probably not an issue for aftermarket wheels.
 
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