Tire size - Team Camaro Tech
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post #1 of 27 (permalink) Old Mar 6th, 07, 05:08 PM Thread Starter
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Tire size

I'm an admitted dork when it comes to tire sizing. I ordered new wheels for my 69 based on what everybody says fits - 17 x 8 with 4.75 BS for the front and 17 x 9.5 with 5.5 BS for the rear. Where I'm confused is tire size. The fronts seem to be pretty standard - 235/45-17. It's the rears where I'm confused. Some run a 275/40-17 and others run a 255/45-17. What's the difference in the sizes and which is most likely to clear without rubbing?

Also - my current tires are 235/60-14. Which of the above mentioned rears come closest in height? I'm concerned about my speedometer being off. It's pretty accurate with the 235/60-14's. Thanks!!


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post #2 of 27 (permalink) Old Mar 6th, 07, 05:26 PM
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Re: Tire size

The 275s fit but they are very tight. If you want NO rubbing go with the 255s. DJD uses 255s because he wanted no rubbing and he does at times load the back of his car down. You may also get some rubbing with the 275s when you go over curb cuts. The most important thing to keep in mind is these cars are not all the same. 40 years in some cases has taken it's toll. I think the 255 stretches out nice on a 9.5 wheel maybe someone can post some close ups of a 255 and a 275 mounted on a 9.5 wheel.

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post #3 of 27 (permalink) Old Mar 6th, 07, 05:26 PM
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Re: Tire size

http://www.1010tires.com/TireSizeCalculator.asp

1968 Camaro Convertible ,350 TWIN TURBO , PTC 3000 stall, Hotchkis TVS kit / Subframe connectors, Caltracs, 9" rear, Street Star wheels (P275/40ZR17 / P235/45/17) , Electric cutouts. [B] .....FOR SALE.....
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post #4 of 27 (permalink) Old Mar 6th, 07, 05:30 PM
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Thumbs up Re: Tire size

Thanks - you beat me! LOL This is very helpfull in answering any tire size questions.

Jack
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post #5 of 27 (permalink) Old Mar 6th, 07, 05:39 PM
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Re: Tire size

Hi Al i have the 275/40-17 rear and the 235/45-17 front . I run the nitto 555 all the way around and really like them , the rears don't last very well i can't figure that out .
Mark.

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post #6 of 27 (permalink) Old Mar 6th, 07, 05:47 PM
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Re: Tire size

I think Mark would need a 475..... to hook up.

The 255 is a safe bet on a '69 and that's what I run. BFG's

Robert

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post #7 of 27 (permalink) Old Mar 6th, 07, 07:16 PM
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Re: Tire size

Al, the sizes you mentioned would be very close in HT, with the 275 being just over an inch wider.

255 is a lot of tire for a 9.5" rim, I'd try the 275. They seem to fit pretty well on almost all 69's from what I read here.

Going over the edge, huh? 'bout time, you'll like it.





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post #8 of 27 (permalink) Old Mar 7th, 07, 06:04 AM
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Re: Tire size

A 275 tire on a 9.5 rim is only 1/4" wider than a 255 tire on a 8 inch rim. Just a thought.

1968 Camaro Convertible ,350 TWIN TURBO , PTC 3000 stall, Hotchkis TVS kit / Subframe connectors, Caltracs, 9" rear, Street Star wheels (P275/40ZR17 / P235/45/17) , Electric cutouts. [B] .....FOR SALE.....
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post #9 of 27 (permalink) Old Mar 7th, 07, 07:54 AM Thread Starter
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Re: Tire size

Thanks, guys. For those of you running the 275 on a 9.5 rim on a 69 - any rubbing? I've already used a body saw and hacked away the outer wheel houses so they are exactly flush with the quarter panel lip. At the top of the wheel well, I have exactly 12" from the inner wheel house to the quarter lip and I'd rather not do any more cutting in there.

Jim - over the edge indeed! It would be tough fitting the new brakes inside my 14" rallys. I've already found a buyer for my wheels and tires, as well as for my factory front discs, and it will offset the cost considerably. I really like the look of the rally wheels on these old cars, and I'm sure I will miss them. The billet rallys are godawful expensive and out of the question for me.

But onward and upward, as they say


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post #10 of 27 (permalink) Old Mar 7th, 07, 08:02 AM
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Re: Tire size

12" should be enough. I'm in the process of rolling my lips and I'm getting 12" also when I'm done. The 275 tire measures 11" total.

Total rim width of a 9.5" rim is really 10.5" with a 275 tire the bulge comes out to be 1/4" SO a 10.5" rim with 1/4" bulge on each side = 11" total

If you measure the correct backspace from the inner well, at least 1/2" that will leave you 1/2" to the outer lip. Should be fine.

1968 Camaro Convertible ,350 TWIN TURBO , PTC 3000 stall, Hotchkis TVS kit / Subframe connectors, Caltracs, 9" rear, Street Star wheels (P275/40ZR17 / P235/45/17) , Electric cutouts. [B] .....FOR SALE.....
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post #11 of 27 (permalink) Old Mar 7th, 07, 03:46 PM
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Re: Tire size

I run a 275 on the rear and had a little rub at first, but a shimmed that tire out 1/4" and where it was hitting on the inner fender I just bent that in about 1/2", can't tell, no rub, also, it has been lowered one inch.

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post #12 of 27 (permalink) Old Mar 7th, 07, 06:31 PM Thread Starter
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Re: Tire size

oops - quoted wrong guy. Does this count in post total? Coooool.


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post #13 of 27 (permalink) Old Mar 7th, 07, 06:32 PM Thread Starter
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Re: Tire size

Quote:
Originally Posted by mnm99 View Post
A 275 tire on a 9.5 rim is only 1/4" wider than a 255 tire on a 8 inch rim. Just a thought.

Thanks - but how much wider is a 275 tire on a 9.5 compared to a 255 on a 9.5?


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post #14 of 27 (permalink) Old Mar 8th, 07, 02:46 AM
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Re: Tire size

Quote:
Originally Posted by BPOS View Post
Thanks - but how much wider is a 275 tire on a 9.5 compared to a 255 on a 9.5?
Around 1 inch. I wouldn't put a 255 tire on a 9.5 inch rim though. A 255 tire measures 10.1" a 275 tire is 11" and the rim measures 10.5 inches. It would look funny with the tire being sucked in on the rim. Thats why the 8" rim makes only 1/4 difference, because of the bulge.

1968 Camaro Convertible ,350 TWIN TURBO , PTC 3000 stall, Hotchkis TVS kit / Subframe connectors, Caltracs, 9" rear, Street Star wheels (P275/40ZR17 / P235/45/17) , Electric cutouts. [B] .....FOR SALE.....
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post #15 of 27 (permalink) Old Mar 8th, 07, 07:00 AM
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Re: Tire size

Mine don't look funny, at least not to me.

Robert

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