TT2s with 235/60/15 - Team Camaro Tech
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post #1 of 10 (permalink) Old Jun 6th, 07, 05:26 PM Thread Starter
 
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TT2s with 235/60/15

Guys,

Ive searched high and lo here but could not find any info on whether 15X7 TTs will work using 235s up front. It seems that the rallys with 4.25 BS will fit based on the posts Ive read but now Im worried since mine are 3.75 BS. I will be installing brand new stock BB springs at the same time, so Im hoping Ill be ok.

Any others run this combo ? Do not want rubbing issues....

Thanks!
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post #2 of 10 (permalink) Old Jun 6th, 07, 06:21 PM
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Re: TT2s with 235/60/15

Andre,

I just responded this week to a question another Forum member PM'd me on. The issue with the TT2 is the negative offset cause by only 3.75 BS. I believe this member had only 3.50" Back Spacing. This person's car was a 1968 Camaro. Out of respect for their privacy I won't mention who they were but we had a nice conversation over PM's and I did my best to help.

Here is the deal. I wasn't born yet when the first 1968 Camaro's rolled off the assembly line in Sept of 1967. But I do know this. The 1968 Z28's had E60x15 tires. Maybe E70x15. I believe E60x15 to equate to P215/60/R15. The P235/60/R15's will rub with that backspacing. I have a 1969 Camaro w/ 15x7 Rally's and I don't have any issues with rubbing and I run P235/60/R15 all the way around. That is because of the backspacing on Rally's. I also have disc brakes on the front of my car and that could make a difference. Most if not all drum brake cars received 14x6 if they were not Z28's. Some SS's received 15x6 if I recall. Most Rally's were 15x7's.

Remember in 1968 cars were still using Bias ply tires. Bias ply tires have more of a square shoulder where as radials have a more rounded shoulder to improve handling & cornering. But the rounded shoulder also will cause tire rub as it increases the contact patch which is known as the footprint of the tire. Just because a tire is a P235/60/R15 form two different manaufactures does not mean it has the same footprint/contact patch. One could still be taller and the other wider depending on the castings/moldings & design by that manufacturer.

Please note: I was in the tire & auto service indurty from 1989-1998. Mostly as an assitant service manager or service writer. Tires were my specialty even at new car dealerships. But since I left the business in 1998 I no longer consider myself an expert in anything and I humble myself everyday when it comes to learning about old cars or new cars. That way I can still learn new things instead of being some arrogant jerk.


Here are 2 helpful links. http://www.turbinecar.com/tires.htm

Drag your mouse over the photos to see how skinny the tires were on these cars.
http://www.kelseytire.com/pages/preformancetires.html


In my humble opinion in your case, there are only two ways to avoid rubbing--especailly if it's a 1968.

1) Go to at least a 4.25" Backspacing
2) Install P215/60/R15 tires instead

Generally speaking you can get more tire in the front of a 1969 than you can a 1967 or 1968 but you can get more tire on the back of a 1967 or 1968 than you can a 1969. FWIW In 1970 GM went to a wider front tire for the Z28's & Trans Am's

P.S. Don't just take my word on this subject, ask some others as well and get their opinions.


Good Luck!!

SSG&H aka Greg

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 #3 of 10 (permalink) Old Jun 6th, 07, 07:33 PM Thread Starter
 
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Re: TT2s with 235/60/15

Crap,looks like my plans of driving my car with new wheels/tires is not happening this weekend. Rims are bought, so I may have to get the springs in on Sat and then see if they have something narrower in stock for the front ties. I was hoping to have the fronts and back fairly close in width as I want to get away from the fats and skinnies look. Was planning on 255 in back with 4.5 BS (rear shocks are moved in board and rear is custom ¨9" that is about 1/2" narrower per side.)

Also have front discs if that matters.
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post #4 of 10 (permalink) Old Jun 6th, 07, 07:39 PM
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Re: TT2s with 235/60/15

I Disagree. On a SEVEN inch wheel, 4.25" backspace is fine.
On an 8" it wouldn't work, but you did type 15x7.





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post #5 of 10 (permalink) Old Jun 6th, 07, 07:45 PM Thread Starter
 
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Re: TT2s with 235/60/15

Jim, to clarify the fronts are 15x7 3.75 BS, I was saying that other posts seemed to indicate that the 235 would work with 4.25 BS. So what is the next widest size I can use 215 ?
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post #6 of 10 (permalink) Old Jun 6th, 07, 07:59 PM
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Re: TT2s with 235/60/15

I have 225-50-16's on 16x7" 3.5" backspace wheels. They cleared with drums, and they clear with wilwood 12" disks. Mine are VERY short tires, 23.5" tall, that makes a difference, but my car is also very low, 12" from the fender lip to the center of the hub.

I guess do some math comparing your ride ht and tire ht to mine. BS difference is only a 1/4". and 235's are ;ess than a half inch wider tghan my 225's.

I do think the other posts you're read are reffering to an 8", 4.25" bs wheel, that would put the center of the tire in the same place as a 7", 3 3/4" bs wheel.





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post #7 of 10 (permalink) Old Jun 6th, 07, 08:18 PM Thread Starter
 
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Re: TT2s with 235/60/15

Thanks for the posts, they offered to mount the tires and if it didnt work, bring in a different size. That just keeps me waiting but what can you do. I still have my old rims and tires to drive until they get what I need. Cant do any measuring right now as the drag springs currently in the car keep my nose right slammed.
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post #8 of 10 (permalink) Old Jun 6th, 07, 08:25 PM
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Re: TT2s with 235/60/15

Greg from South Side Goons & Hitmen replied to me about my problem with Torq Thrusts. The 215 60 15s fit perfectly. That would be my recommendation. He is absolutely correct.
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post #9 of 10 (permalink) Old Jun 6th, 07, 08:29 PM Thread Starter
 
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Re: TT2s with 235/60/15

C n C,

What was your complete combo ? Looking to see how wide you went in back
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post #10 of 10 (permalink) Old Jun 9th, 07, 07:09 PM Thread Starter
 
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Re: TT2s with 235/60/15

In case anyone is interested, I ended up with 215/65/15 up front and that worked great. Kept the overall diameter the same as the 235/60's and to be honest I dont think I'd want any wider with that rim - it would stick out to far for my taste. Used 255/60's out back and that looks good also.

Thanks again for all who posted.
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