Tire Size - Team Camaro Tech
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post #1 of 16 (permalink) Old Sep 24th, 13, 09:32 AM Thread Starter
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Jerry
 
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Tire Size

Just purchase a set of 15"x7" rally rims with a 4.25 backspacing for my 67 RS. I need suggestion on what tire size I need to purchase to avoid tire rub. I want the same size tire on all four corners and the car is presently sitting at about stock height. I have read many threads on different sizes but would like to hear the pro and cons, any help will be greatly appreciated.
Thanks,
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post #2 of 16 (permalink) Old Sep 24th, 13, 09:46 AM
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Re: Tire Size

235/60/15 is hands down the most popular size 15" tire used on all 4 corners on 1st gens and you have the right backspacing for them. The tires are 26" or 26.1" tall, wide enough to help the car in the corners a bit and usually only very lightly scuff the inner fender on lock to lock turns on most cars.

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post #3 of 16 (permalink) Old Sep 24th, 13, 06:29 PM Thread Starter
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Re: Tire Size

Thanks for the reply Dennis, but does it make any difference that I have drum brakes all the way around. Would I be better off with a 225/60/15 to avoid any tire rub?
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post #4 of 16 (permalink) Old Sep 24th, 13, 07:04 PM
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Re: Tire Size

The 235 is 1/2" taller, 1/2" wider in section width and weighs 2 lbs more than the 225 so you certainly would gain clearance with the 225. I don't think there is any issue with the brakes as the 235 is within 1/10" of the factory tire height. As well, typically if your speedo gear has never been changed the 235 will be more accurate. I ran 235's on my '69 when I got it and the very slight rubbing on the inner fender only manifested during higher speed lock to lock turns... Not something you do all that often and caused no blemishing on the tires themselves.

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post #5 of 16 (permalink) Old Sep 24th, 13, 07:56 PM
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Re: Tire Size

Just as an exercise, consider:

Assuming your Camaro originally had 14 wheels with either F70-14 (26.2" dia), or 7.35-14(25.96" dia), a 215/65/15 (26.1" dia) would most closely preserve your driving gear ratio.

The 225-60/15 (24.7" dia) would effectively lower your final drive gear ratio approximately 5.7%, making a 3.55:1 ratio drive like a 3.75:1 gear, perhaps improving acceleration, but lowering gas mileage.

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post #6 of 16 (permalink) Old Sep 25th, 13, 04:50 AM
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Re: Tire Size

I've been running 15x7" Cragars with 4" backspace, and 235/60/15 tires all the way around. The car is lowered and I have yet to have a tire rub either in the front or the back.

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post #7 of 16 (permalink) Old Sep 25th, 13, 05:06 AM Thread Starter
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Re: Tire Size

Great information, Dennis is there much difference between the wheel opening on a 67 verus a 69? I would like to hear from anyone running the 215/65-15 and their comments.
Thanks,
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post #8 of 16 (permalink) Old Sep 25th, 13, 07:20 AM
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Re: Tire Size

Jerry - the '69 is said to have slightly deeper wheel wells but it also has the smaller wheel opening as it's squared off on top.

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post #9 of 16 (permalink) Old Sep 25th, 13, 11:27 AM Thread Starter
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Re: Tire Size

I am asking because after reading many threads it seems that the 67 and 68 have more issues with the tire rub with a 235/60/15 than the 69. I like the look of the wider tire but am also interest in the 215/65/15 which seems closer to the stock look and no tire rub, comments welcomed. Just trying to be sure before purchasing.
Thanks,
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post #10 of 16 (permalink) Old Sep 25th, 13, 11:35 AM Thread Starter
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Re: Tire Size

After reading many threads is seems as if the 67 and 68 have more issues with tire rub with the 235/60/15 than the 69. I really like the look of the wider tire but am also interested in the 215/65/15 which seems to be more of a stock look with no tire rub, comments welcomed. Just trying to be sure before purchasing.
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post #11 of 16 (permalink) Old Sep 25th, 13, 02:52 PM
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Re: Tire Size

I probably wouldn't go with anything less than a 235 on the rear. 215/65/15's are great for the front. Nice balanced tire, but will look a bit small on the rear.

If you are looking for the same tire, front to back, as DJD suggested, I'd go with the 235/60/15, and deal with minor tire rub at full lock, if at all.

I'm running 235/70/15's in the rear and 225/70/15's in the front, with no issues. I chose a little taller tire, and trying to achieve a 2" rake back to front.
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post #12 of 16 (permalink) Old Sep 26th, 13, 10:13 AM
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Re: Tire Size

i have 215/65/15's all the way around and agree they look a little small on the rear. Like yourself i wanted the same size tire all the way around. You can see what it looks like in my photo album. Next time around i will probably go with 235/60/15's or 225/70/15's. I like the 225/70's taller height to help reduce my highway rpm's, currently running 4:10's.
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post #13 of 16 (permalink) Old Sep 27th, 13, 03:14 PM
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Re: Tire Size

I'm debating the 235/60 vs. the 215/65 for my stock 69 with 15 x 7 FW Rallys. One concern, the 215/65 BFG Radial T/A always seem to be backordered on Tire Rack. They seem to be getting harder to find.

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post #14 of 16 (permalink) Old Sep 27th, 13, 06:23 PM
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Re: Tire Size

Quote:
Originally Posted by Tom P View Post
I'm debating the 235/60 vs. the 215/65 for my stock 69 with 15 x 7 FW Rallys. One concern, the 215/65 BFG Radial T/A always seem to be backordered on Tire Rack. They seem to be getting harder to find.
Try here for 215/65/15's.

http://www.mustangsunlimited.com/ite...sp?T1=16664+01

I know that they currently have them in stock and the service/communication is very good.
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post #15 of 16 (permalink) Old Sep 28th, 13, 04:33 AM
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Re: Tire Size

215/60 or 65 seem to look too small for my taste. Of my 4 69's, each with different size tires, I like the 225/60/15, and 225/14/70 fill up the wheel well just a little to much.
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