With an 18" tire how wide can I go in back on a first gen? - Team Camaro Tech
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post #1 of 5 (permalink) Old Jan 8th, 06, 12:15 AM Thread Starter
 
Join Date: Oct 2005
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With an 18" tire how wide can I go in back on a first gen?

I know a 275 will fit in a 17" tire out back, but with the 18's can you get any more? Possibly a 285? I'm looking to go with a 285/30/18. Will it work without rubbing? Also, will I have to relocate the shocks inboard a little? Thanks
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post #2 of 5 (permalink) Old Jan 8th, 06, 01:01 AM
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Re: With an 18" tire how wide can I go in back on a first gen?

on a 67 and 68 275 is very tight no mater what size rim
but if you have a 69 you might be able to get a 285
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post #3 of 5 (permalink) Old Jan 8th, 06, 06:04 AM
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Re: With an 18" tire how wide can I go in back on a first gen?

Lots of variables here - ride height - disc brakes - tire brand - wheel width and back spacing - makes your head hurt! Bottom line there are cars that have run 18x10s with a 285/35 with 5.75 back space with sucsess and there are cars that have run 275s on 9.5s with 5.5 back spacing and had rubbing issues that were severe enough to drop down to 255/45s. The point - each car is different and you have to decide how much inconvience you want to put up with when it comes to rubbing issues. I would say the upper limit is 275s on a 9.5 wheel with 5.5 to 5.75 back space. Bottom line measure carefully or better yet test fit if possible before you buy.
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post #4 of 5 (permalink) Old Jan 9th, 06, 01:21 PM Thread Starter
 
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Re: With an 18" tire how wide can I go in back on a first gen?

Thanks
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post #5 of 5 (permalink) Old Jan 9th, 06, 04:46 PM
 
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Smile Re: With an 18" tire how wide can I go in back on a first gen?

First, please use the old "finger" method to determine how far outta square your car is!

You just walk around it and insert a finger or two, maybe three right at the top center of the wheel well opening and the tire shoulder!

Our cars are known for being off quite a bit STOCK!!

My car fingers about 1 and a 1/2 on the drivers side and almost two on the pass. side!

I have fingered many cars just to see how mine is compared to others and almost all of them seem to be off a schosh regardless too!!

It's a crude method of checking our cars over, but after you do it several times, it turn's out to be a very reliable check methd of the body/chassis placement relationship!

And fwiw, GM thought up to +/- a 1/2" was fine back then so go figure!!!!

pdq67

PS., and I almost forgot to say to also "finger" the S/F dowel checking holes right at the firewall bends too.... This way you will know if your S/F is right too.



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