15x7 vs 15x8 - Team Camaro Tech
Wheels & Tires What fits what?

 
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post #1 of 8 (permalink) Old Dec 5th, 05, 11:06 AM Thread Starter
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Question 15x7 vs 15x8

All things being equal, will a 15x8 with a 235/60/15 "fit" the front of my 69 Camaro the same as a 15x7 rim with the same tire??? The back spacing on the 15x8 is 4.5, not sure about the 15x7 except it's coded FW, haven't measured it yet. If the 8's rub at full turn, will the 7's do the same thing with the same size tire, or will the backspacing determine this????
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post #2 of 8 (permalink) Old Dec 5th, 05, 11:26 AM
 
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Re: 15x7 vs 15x8

I have 15x7 225/60 R15 with 3 3/4 back space on front. 15x8 255/60R15 with 4 1/2 bs on rear. Car lowered 2" in front, stock rear with no problems. I would think 15x8 with 4 1/2bs would be no problem.
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post #3 of 8 (permalink) Old Dec 5th, 05, 11:53 AM Thread Starter
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Question Re: 15x7 vs 15x8

It is a problem for me, and my car sit's relatively high in the front, that's why I decided to swap the 14 inch SS wheels for the 15 Ralleyes to begin with. The 15x8 AZ coded Corvette ralleys I installed rub at full turn, on the inside frame rail. I was just wondering if the same tire, a 235/60/15, on a 15x7 rim would have a better chance of fitting without rubbing!
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post #4 of 8 (permalink) Old Dec 6th, 05, 09:21 AM
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Re: 15x7 vs 15x8

I would think that on the 15x7 the section width ( of the tire) would be narrower and make the tire a little taller. I have seen a couple of posts about 15x7 backspacing.... 4 1/4 and 3 3/4..... I think the 4 1/4 bs is a custom offset????
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post #5 of 8 (permalink) Old Dec 6th, 05, 12:38 PM
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Re: 15x7 vs 15x8

I am assuming your 7” FW wheels have a 4.25” backspace and your 8” wheels have 4.5”.

Let’s say you have a tire with 8” of tread on an 8” wheel. Now if you put this same tire on a 7” wheel the tread will extend ½” beyond the rim on each side. We are only concerned with the back side for now. If both wheels have the same backspace the 7” wheel will move the tread of the tire in ½”. The 4.25” backspace of your 7” wheels will move the tire out only Ό” and that will leave you with your tires tread Ό” closer to your frame with the 7” wheels.

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post #6 of 8 (permalink) Old Dec 6th, 05, 03:30 PM Thread Starter
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Re: 15x7 vs 15x8

Now I'm really confused. I guess all I can really do is try it and see what happens, I'm certain the 15x8's rub, we'll see about the 15x7's, I'll post back after the switch! Thanks!!!!
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post #7 of 8 (permalink) Old Dec 14th, 05, 08:32 AM
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Re: 15x7 vs 15x8

Quote:
Originally Posted by kz1000ltd
It is a problem for me, and my car sit's relatively high in the front, that's why I decided to swap the 14 inch SS wheels for the 15 Ralleyes to begin with. The 15x8 AZ coded Corvette ralleys I installed rub at full turn, on the inside frame rail. I was just wondering if the same tire, a 235/60/15, on a 15x7 rim would have a better chance of fitting without rubbing!

If those are true Covette Ralley's then the back spacing should be 4 inches not 4.5. I have a set on my 68 camaro and they are 4.5 B/S. They are from NPD they do not rub the frame. If yours are rubbing I would recheck the BS and look to see how square your subframe is. Measure the distance from the wheel well on both sides.
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post #8 of 8 (permalink) Old Dec 14th, 05, 08:41 AM
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Re: 15x7 vs 15x8

Quote:
Originally Posted by kz1000ltd
It is a problem for me, and my car sit's relatively high in the front, that's why I decided to swap the 14 inch SS wheels for the 15 Ralleyes to begin with. The 15x8 AZ coded Corvette ralleys I installed rub at full turn, on the inside frame rail. I was just wondering if the same tire, a 235/60/15, on a 15x7 rim would have a better chance of fitting without rubbing!

If those are true Covette Ralley's then the back spacing should be 4 inches not 4.5. I have a set on my 68 camaro and they are 4.5 B/S. They are from NPD they do not rub the frame. If yours are rubbing I would recheck the BS and look to see how square your subframe is. Measure the distance from the wheel well on both sides.
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