Tires Rub on Launches - Pontiac GTO Forum
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post #1 of 25 (permalink) Old 03-22-2010, 11:15 PM Thread Starter
 
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Tires Rub on Launches

Im running a 275 tire on a 17" summit star wheel with 6.00" of backspacing....exactly what i measured, and what the tech departmentat summit told me would work. When I launch my car the tires rub pretty bad on both sides....Fenders have been rolled three times.....still can roll more though. When launched the car squats alot, and would tuck the 275 on a stock wheel, over half way down the sidewall.....

Would Drag Bags be the solution to stiffen up my car to keep it from squatting to much?

All help will be greatly appreciatied!!

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #2 of 25 (permalink) Old 03-23-2010, 12:57 AM
 
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re

Are the rims 8 inches wide. Also I think you need more than 6 inches of BS more closer to seven inches. I would guess 6.50 or 6.75 of BS so figure out your measurement by how much space you have on the inside closest to the inner quarter I think you need 3/4 of an inch then measure to the inside of the fender lip. You want the tire at least 1/2 inch inside of the edge of the quarter panel. Most likely you will not find a rim that will meet these measurements since pontiac didnt give our rims the correct backspace. If you look at the tire you will see that it sits just under the quarterpanel. It should sit inside the quarter not under it. So if you have the wrong Offset or backspace your rim and tire will sit to far outside the rear quarter hence forth tire rib. If anyone has the correct measurements please post it. I also had this problem with a set of 15 inch rims I put slicks on. Now I have a set of 94 S-10 4X4 rims that have 6.75 inches of back space and with the stock S-10 tire which was like a 255-75-15 (A hugh tire) it tucked in nicely with no rub----danfigg ----I think it is 171.45mm of BS------------6.75 X 25.4=177.45-----Someone please correct me if im wrong inches X 25.4 converts inches into mm
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post #3 of 25 (permalink) Old 03-23-2010, 08:02 AM
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Originally Posted by danfigg View Post
Are the rims 8 inches wide. Also I think you need more than 6 inches of BS more closer to seven inches. I would guess 6.50 or 6.75 of BS so figure out your measurement by how much space you have on the inside closest to the inner quarter I think you need 3/4 of an inch then measure to the inside of the fender lip. You want the tire at least 1/2 inch inside of the edge of the quarter panel. Most likely you will not find a rim that will meet these measurements since pontiac didnt give our rims the correct backspace. If you look at the tire you will see that it sits just under the quarterpanel. It should sit inside the quarter not under it. So if you have the wrong Offset or backspace your rim and tire will sit to far outside the rear quarter hence forth tire rib. If anyone has the correct measurements please post it. I also had this problem with a set of 15 inch rims I put slicks on. Now I have a set of 94 S-10 4X4 rims that have 6.75 inches of back space and with the stock S-10 tire which was like a 255-75-15 (A huge tire) it tucked in nicely with no rub----danfigg ----I think it is 171.45mm of BS------------6.75 X 25.4=177.45-----Someone please correct me if im wrong inches X 25.4 converts inches into mm
I think you have it (except I think you meant the highlighted word). I'll bet he has too narrow of a rim too. 275s would need at least a 9-9 1/2" rim to not bulge the sides in addition to the back spacing issue. As I've stated many times also it depends a lot on what brand of tire as they all run different actual widths. Drag bags are a hack fix to a mismatched wheel but it may be the only real solution to the problem if the OP wants to stay with that tire/wheel combo. It will look like a 60s throwback with the rake and ride like a buckboard but. . .

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post #4 of 25 (permalink) Old 03-23-2010, 09:25 AM
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As stated above, the section width changes between different tire brands. Not saying that you are but some people get hung up on having the look of a wider tire. That's cool but wider doesn't necessarily mean better performance. One thing you can do is take your wheels to a reputable wheel shop and see if they can "safely" remove a few millimeters from you wheels. That's what I did. I had 3 mms removed from my rear wheels for $35 a wheel.

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post #5 of 25 (permalink) Old 03-23-2010, 09:35 PM
 
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Section width is the approx. width of the tire.

And yes drag bags will help the car from squatting.



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post #6 of 25 (permalink) Old 03-24-2010, 01:14 AM Thread Starter
 
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The tires are nitto 555R's They dont actually bulge much at all since nittos section width is smaller than most. The rim measured approx. 8.4" wide and 17.2" tall. the tires are actually even with the lip of the fender as of right now. the car actually sqauts a little much for me, some squat is good, to much is bad....but i think the shocks could have something to do with it. You can actually watch the car squat and raise back up when pulling the car into reverse or drive....Theres not any good tire shops around here. Im in Northern AL. The only thing around here is a few machine shops that probably could handle it.... I'll try and get some pics of the car and where the wheels are on the fender and post them. Quite possibly even a launch pic.. Thanks for the info guys!

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #7 of 25 (permalink) Old 03-24-2010, 07:55 AM
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Section width is the approx. width of the tire.

And yes drag bags will help the car from squatting.
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post #8 of 25 (permalink) Old 03-28-2010, 09:12 PM Thread Starter
 
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Drag bags are ordered and will be here tomorrow. Ive gotten most of the rub out by rolling the fenders again. With the help of a soft mallet.... Decided to jack the front of the car up on the front corners to see where the fender was still rubbing....gave me a great idea and got 98.9% of it by doing that.....Thanks for the help though guys....any other suggestions will be appreciated though!!

Thanks,
Tyler

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #9 of 25 (permalink) Old 03-30-2010, 10:54 PM
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Originally Posted by SpdKilz View Post
Drag bags are ordered and will be here tomorrow. Ive gotten most of the rub out by rolling the fenders again. With the help of a soft mallet.... Decided to jack the front of the car up on the front corners to see where the fender was still rubbing....gave me a great idea and got 98.9% of it by doing that.....Thanks for the help though guys....any other suggestions will be appreciated though!!

Thanks,
Tyler
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post #10 of 25 (permalink) Old 03-31-2010, 02:40 AM
 
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Silly question but your not on stock springs and shocks are you? If so get to work.

<-- Guess which ones quicker?.....Nope! Not even close.
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