235 60 15 & 255 60 15 , will they hit on 69's ? - Team Camaro Tech
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post #1 of 10 (permalink) Old May 13th, 01, 05:06 AM Thread Starter
 
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What backspacing , etc ?

Wanting to use new ARE 15x7 Torque Thrusts on a stock ride height 69.
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post #2 of 10 (permalink) Old May 13th, 01, 06:37 AM
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In my opinion, those are the optimal size tires for 1st generation Camaros. Do a search on the subject, it's been discussed at length a zillion times. Those are the sizes I run on my 15x7 ralleyes, with 4 1/2 inch backspacing. You might be able to squeeze a little more meats in the back, depending on the state of your rear suspension, but up front, that's about as good as it gets without rubbing......KZ

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post #3 of 10 (permalink) Old May 13th, 01, 06:59 AM
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Mike H
 
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john:
your car looks great,
is 4-1/2" backspace stock? i thought 4" was all that is needed on a 7" rim. I'm looking at getting some new rallies and need to know, btw, i have disc up front.

thanks,
mike

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post #4 of 10 (permalink) Old May 13th, 01, 07:10 AM Thread Starter
 
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Thank you.

I did read all I could on the tire & wheel board , but there was so much argument /opinions back and forth with people saying they did & didn't work that I came away with a feeling that no one had a definitive answer.

I don't really want to try and squeeze any more than the 235 / 255's on it....Goodyear only makes the Eagle " Nascar " tire in a few sizes , and 235 & 255 60 15's are as close as they come , they don't make a 225 or I'd use it on the front.

Thanks again...

Brian

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post #5 of 10 (permalink) Old May 13th, 01, 07:22 AM
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Dana
 
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Brian, I would say 235 & 255 is the biggest you can get on a stock ride height unmodified wheel well '69. I have 255/60-15 BFG TA's on the back of my SS396 right now with no problems (except even they won't hook up), but I have had them on other 69's and had them slightly rub on the edge of wheel lip at inside top. Same with 235's on front, sometimes no rub (barely), sometimes rub just a litle. To be 100% safe I usually go 225's and 245's. Just my experience with 15+ '69's in the last 20 years. Good Luck!

------------------
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post #6 of 10 (permalink) Old May 13th, 01, 07:26 AM
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Mike H
 
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brian:
if you run the 235/255 combo, the difference in overall height front to back will be about an inch, since the 255 is a taller tire.

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post #7 of 10 (permalink) Old May 13th, 01, 09:50 AM
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Huh? The 235 and 255 numbers are the width of the tire, I believe the 50, 60, 70 series numbers determine the height? Someone correct me if I'm wrong......KZ

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John D. Smith
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post #8 of 10 (permalink) Old May 13th, 01, 12:40 PM
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Mike H
 
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john:

You are right about that, the 235 does represent the width, but the sidewall height is determined by the 70/60/50 etc.

So a 235/60/15 has a sidewall ht. of 60% of 235, whereas the 255/60/15 has a sidewall ht. of 60% of 255, which is greater and will make the tire taller.

Here are some calcs from a table i created:

tire size rim width sidewall overall
225 60 16 8.86 5.31 26.63
245 55 16 9.65 5.31 26.61

235 60 16 9.25 5.55 27.10
255 55 16 10.04 5.52 27.04

215 70 14 8.46 5.93 25.85

235 55 16 9.25 5.09 26.18

225 55 15 8.86 4.87 24.74
245 50 15 9.65 4.82 24.65

225 65 15 8.86 5.76 26.52
245 60 15 9.65 5.79 26.57

215 70 14 8.46 5.93 25.85

235 60 15 9.25 5.55 26.10
255 55 15 10.04 5.52 26.04

235 65 15 9.25 6.01 27.03
255 60 15 10.04 6.02 27.05

225 70 15 8.86 6.20 27.40





[This message has been edited by mr69 (edited 05-13-2001).]
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post #9 of 10 (permalink) Old May 13th, 01, 01:49 PM
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Ive got the exact combo on my 68 235/60s on front and 255/60s on rear with new torque thrust wheels. 15/7 on front and 15/8s on the rear. it looks great. probably the biggest i could run.
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post #10 of 10 (permalink) Old May 13th, 01, 06:39 PM
 
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lloyd,
would it be possible for you to post a couple of pictures of your 68? And the backspacing on your wheels?
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