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wheel question new 71 mach 1 owner


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I know this probably gets asked a lot. I know 15x8 magnum 500 with 4.5 backspacing with 245 60 15 will fit up front. but I'd like to get cragar ss 15x8 but they only come in 4.25 backspacing will that 1/4" make a difference in fitment? I was gonna go 15x8 all around with 245 60 in front and 275 60 in rear 

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I have Cragar SS 15x7, 4 1/18”, BS, 255/60/15 on the front and 15x8, 4 1/4” BS, 275/60/15 on the rear. The front rub slightly on the frame when the wheel is fully turned. The rear rubs slightly on the lip. I think with the 245/60/15 on the  front it would not rub. The rear needs to be at least 4 1/2” or 5” BS so it would not rub with the 275’s. 

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Edited by 73429mach

1973 Mach 1, Porsche Guards Red, 429/C6

1972 Mach 1, Grabber Blue, 302/C4, currently under construction

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The 1/4" won't make much difference, will give you a little less clearance on the fender lip, and more clearance on the inside.

If you want to take some measurements and see what the estimated inside and outside wheel and tire clearances are you can try the spreadsheet in the thread:

Tire Sizes - Suspension, Handling, Brakes, Wheels and Tires - 7173Mustangs.com

Edited by Don C

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

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49 minutes ago, cfdfire40 said:

would 15x10 be pushing it with a 275 60? I thought about ordering some torque thrusts with custom offset 

15x10 should work with the 275/60/15’s with the right backspacing. There are others running that combo. If you do a search on 15x10 there are threads that can get you the right backspacing. 

Edited by 73429mach

1973 Mach 1, Porsche Guards Red, 429/C6

1972 Mach 1, Grabber Blue, 302/C4, currently under construction

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