Will 8" rims fit without rubbing? - Pontiac GTO Forum
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post #1 of 23 (permalink) Old 09-21-2009, 06:09 PM Thread Starter
 
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Will 8" rims fit without rubbing?

Hey everyone,

I need new tires for my 67 GTO and would like to get some larger rims if they will fit. I currently have 15" rims that are 7" wide with 4.5" backspacing. I would like to go with 15" rims from wheel vintiques that are 8" wide. The big question is...will they fit in front without rubbing? The wheels are offered with 4.5" or 5.0" backspacing. According to my measurements the 5.0" backspacing should work better...but I'm not really sure! Tires will be 235/60/15 in front...again if they fit. Not sure about the back...maybe 255/55/15 or 275/50/15....but BFG does not make that size. Can anyone help?

Hollie
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post #2 of 23 (permalink) Old 09-21-2009, 07:09 PM
 
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Hollie, If you go on Tirerack.com, thet have a drop down that you can fill in. This will give you the height, width, ground contact width, recomended wheel width, load range, etc. This info should help you with measurements, that will help you decide which size tires to buy. Eric



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post #3 of 23 (permalink) Old 09-21-2009, 07:46 PM Thread Starter
 
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Thanks Eric, I will check it out.
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post #4 of 23 (permalink) Old 09-21-2009, 07:58 PM Thread Starter
 
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Unfortunately tirerack.com only lists the recommended tire size for my car. With a 15" rim they recommend 225/60/15 tires. I still don't know if an 8" rim will fit in the front, and I'd like to run a 235/60/15 tire because the total height is exactly the same as the original tires.
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post #5 of 23 (permalink) Old 09-21-2009, 08:22 PM
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Attached is an image showing front and rear side clearance from RS Racing;

Click here for a Tire Spacing and Offset calculator from; Autolounge.net

If you can get the correct backspacing the low profile 50 or 60 aspect ratio should not rub the front fender directly in front of the tire. Hope the information is helpful.
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Randy


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post #6 of 23 (permalink) Old 09-22-2009, 07:09 PM Thread Starter
 
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Thanks for the info Randy. You've given me excellent advice on how to measure my wheel for clearance. However, having never done this before I don't really trust my measurements 100% on the front wheels as they are much closer to the fenders and suspension than the rear wheels. I believe 8" wheels will fit, but I'm tempted to order just two in case they don't. In that event I would put the 8" wheels on the rear and buy 7" wheels for the front.

I would still like to hear from someone who has 8" wheels on a 66' or 67' GTO! Is there anyone out there who has advice on this?

Hollie
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post #7 of 23 (permalink) Old 09-23-2009, 08:31 AM
 
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Hollie, On the Tire Rack site. there is a spot to shop "tires by size". between Randy's info and the tire dimension info, you should do alright. Personally, I would sacrifice width for suspension travel/rubbing issues. Nothing sux worse than driving down the road worrying about dips, curves, and are my tires gonna hit!!!!!!!!!!!!!!! Eric



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post #8 of 23 (permalink) Old 09-23-2009, 08:37 AM
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Narrower tires will ride better too.....
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post #9 of 23 (permalink) Old 09-25-2009, 07:35 AM
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You don't want a 235 on an 8" wheel. The sidewall will stick out beyond the tread and look like a ricer.....
The recommended wheel width for a 235 is 6-7 inch. Keep the 7" wheels you have for the front and get 8" for the rear.

Mitch
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post #10 of 23 (permalink) Old 09-26-2009, 12:11 PM
 
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Too big and you start having "rotational mass" issues. Wheel bearing wear, brake, and alignment issues etc.



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