Biggest "P series radial tires on a 1969 - Team Camaro Tech
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post #1 of 9 (permalink) Old Aug 14th, 07, 07:22 PM Thread Starter
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Biggest "P series radial tires on a 1969

Hello All,

I have a 1969 Camaro. It is multi leaf and has 4 leaf springs. I currently have P235/60/R15 on 15x7 Rally's. I would like to increase the tire size to help cut down the RPM's on the highway.

++++++Question:What is the largest tire I can get under there without mini-tubbing the thing or the tires rubbing on the quarter panels and/or wheel housings? Is it P275/60/R15 on a 15x8 Rally wheel? Or P255/60/R15 on a 15x8 or 15x7 or maybe P255/70R15?

I know I try to give out advice on the tire thread and alot of you have PM'd me and said you really appreciate it. Thank You!! But now I need your help. Any and all comments are always welcomed!!

Thanks!!

Greg aka SSG&H

1) 1969 Camaro RS 396 TH 400, 12 bolt 3:73 sold 1994
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2) 1984 Z28, 5.0 H.O. T-Tops, G92 3:73, sold 1994
3) 1988 5.7L IROC-Z, sold 1994
4) 1969 Camaro bought 2006, back on the road in 2010
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Last edited by South Side Goons & Hitmen; Aug 14th, 07 at 09:32 PM. Reason: try
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post #2 of 9 (permalink) Old Aug 15th, 07, 06:05 AM
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Tory
 
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Re: Biggest "P series radial tires on a 1969

For your rear tires, 255 60 15s on a 15x7 Rim. I that size on my 68 Camaro with no issues. 275 60 15s will rub.
Hope this helps.
Tory
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post #3 of 9 (permalink) Old Aug 15th, 07, 07:18 AM
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Re: Biggest "P series radial tires on a 1969

I run the 255's on 8 inch rims with 4 1/2" backspace, lots of room.

As for what will fit, that depends a lot on how well your rearend is centered in the car, and also how much the sidewall bulges on the tire you choose (worth noting that a 275-60-15 will have considerably more sidewall buldge than a 275-40-17)

When I wear out this set of tires, I'm hoping to be able to go to a 275 on my existing 17" rims. I'll do some very careful measuring first.

I tried some 275-60-15 hoosier quicktimes on 15x7 stock second gen rims last year, the pass side rubbed bad on the inside. These are very bulgy tires tho, and mt new rear seems to be centered a lot better than the old one.





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post #4 of 9 (permalink) Old Aug 15th, 07, 08:27 AM Thread Starter
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Re: Biggest "P series radial tires on a 1969

Yea, I heard that about P275/60/R15. I actually used to sell alot of those back in the day to the Chevelle guys & GTO/Lemans crowd. But I have been out of that game for over 9 years....They are bulgy tires... A buddy of mine had them on his 1970 Lemans.

Basically what I am trying to do is avoid going with a gear vendors overdrive. That $2,395 + tax & shipping could be better spent elsewhere...I think I may be able to avoid the gear vendors with a 3:73 or 3:55 gear and a 28.00" diameter tire. I also have two 15x8 Rally wheel's that are brand new & have never been mounted. I'm curious to see how these would fit. But from what I have always seen you can get more tire in the back of a 1967 or 1968 than a 1969 and more tire in the front of a '69 than a '67 or '68...

1) 1969 Camaro RS 396 TH 400, 12 bolt 3:73 sold 1994
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2) 1984 Z28, 5.0 H.O. T-Tops, G92 3:73, sold 1994
3) 1988 5.7L IROC-Z, sold 1994
4) 1969 Camaro bought 2006, back on the road in 2010
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post #5 of 9 (permalink) Old Aug 15th, 07, 08:30 AM
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Re: Biggest "P series radial tires on a 1969

The gear vendors are cool, no doubt, and if (when!) I have a class A motorhome, it will have one.

With a car, I'd go with a properly built up 4 speed automatic tho, or since I'ma 3 pedal guy, my good ole' TKO!





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post #6 of 9 (permalink) Old Aug 15th, 07, 03:10 PM Thread Starter
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Re: Biggest "P series radial tires on a 1969

Jim,

That motorhome comment was hilarious. Yea I have heard that too about Gear Vendors. Who cares about Gear splitting as most of us here don't have all out drag race cars or even motor homes. I wish US Gear (located on Chicago's South Side) would put their heads together and make a smaller version of their V2OD to fit our Camaro's without heating & bashing in the floor pans an inch and 1/2 on each side.

I know I have been ripping on my T-10 4 speed alot but that's only because this car was not a factory 4 speed car and it could have been converted much better than it was. That part of it is aggravating.

I talked to a guy today who said on my 1969 with 15x8's a P 275/60/R15 should clear on the back providing the rear end is centered correctly and that the leaf springs are in good shape. That's pretty much what you said...

1) 1969 Camaro RS 396 TH 400, 12 bolt 3:73 sold 1994
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2) 1984 Z28, 5.0 H.O. T-Tops, G92 3:73, sold 1994
3) 1988 5.7L IROC-Z, sold 1994
4) 1969 Camaro bought 2006, back on the road in 2010
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post #7 of 9 (permalink) Old Sep 5th, 07, 08:14 AM
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Re: Biggest "P series radial tires on a 1969

Hi Greg,
The problem with the 275 60 15s are that they will rub on the inside and if you have passengers in the back seat, you will hit the top of the tire to the wheelhousing.
The 255s on my Camaro are perfect. I would rather be safe than sorry.
Tory
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post #8 of 9 (permalink) Old Sep 6th, 07, 09:40 PM Thread Starter
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Re: Biggest "P series radial tires on a 1969

Thanks for the reply Tory!

Yea, the last thing I want is for my car to look like my buddy's old 1968 Firebird back in the day. He had a healthy 454 BBC, TH-400 & 12 bolt w/ 3:73's...The rear end on that thing was jacked up 500 feet high and he had N50-15 tires on it. I think that equates to P295/50/15 in a radial or maybe 315/50/15 in a radial. Some of the guys in the early 1990's had their rear ends jacked up Higher than the Sears tower with P315/50/15....I hated that look then and I still dislike it today. A race car is one thing it's cool. But a car on the street with rear tires & no tubs jacked up from here to the moon with 55 gallon drums as rear tires & something like a P155/80/R13 as a front tire...man that just cracks me up!! LOL


Greg aka SSG&H

1) 1969 Camaro RS 396 TH 400, 12 bolt 3:73 sold 1994
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2) 1984 Z28, 5.0 H.O. T-Tops, G92 3:73, sold 1994
3) 1988 5.7L IROC-Z, sold 1994
4) 1969 Camaro bought 2006, back on the road in 2010
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post #9 of 9 (permalink) Old Sep 7th, 07, 10:33 AM
 
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Re: Biggest "P series radial tires on a 1969

I run 255-60x15 on 8" rallyes with 4-1/2" backspace. No rubbing,ever.
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