Front tires rubbing - Team Camaro Tech
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post #1 of 11 (permalink) Old May 18th, 09, 10:53 AM Thread Starter
 
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Front tires rubbing

When I switched from factory drum to disc brakes I also switched from my original 14x6 rally wheels to 15x8 rallyís. I first installed 235x60x15 BF Goodrich tires tires all around but the front rubbed a lot in just normal driving. On the shopís recommendation I switched the front to 215x65x15 with 4.5 BS. That improved the situation but I still get bad rubbing on hard turns, particularly on hills.

Suggestions?
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post #2 of 11 (permalink) Old May 18th, 09, 11:13 AM
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Re: Front tires rubbing

Year/Model? Which part of the tire is rubbing against what? Any other suspension mods?

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post #3 of 11 (permalink) Old May 18th, 09, 01:10 PM Thread Starter
 
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Re: Front tires rubbing

Duh- Guess I did leave out some rather critical information. It is a 1969 Camaro.
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post #4 of 11 (permalink) Old May 18th, 09, 01:32 PM
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Re: Front tires rubbing

So sounds like you have a 15x8 front wheel with 4.5 BS. You started out with 235x60 tires but switched to 215x65 tires. Still would be good to know which part of the tire is rubbing against what? I've been shopping for tires/wheels recently. Per research and what I am being told by the wheel guys, the recommended BS for a 7 inch wheel is 4 inches. I considered 8 inch wheels but the style of wheel I wanted only came with a 5 inch BS. I was told that ideal BS for a 8 inch wheel is 4.75/4.875 and 5 inch BS has caused the tierod/rim clearance issues. I am wondering if your setup may have too little BS and it's the outer part of the tire rubbing against the fender lip or fender bolts... The "hills" part is a bit interesting. Is that uphill or downhill or both?

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post #5 of 11 (permalink) Old May 18th, 09, 01:37 PM Thread Starter
 
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Re: Front tires rubbing

It does appear to be rubbing on the outside of the tire. Question: (my ignorance is really going to show here) Can the backspacing be changed on a wheel, and if so, how is that done?
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post #6 of 11 (permalink) Old May 18th, 09, 01:54 PM
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Re: Front tires rubbing

I believe more backspacing is required as the disc hub sets out the wheel further than the drum hub.

Backspacing is accomplished by cutting the welds between the wheel hub and rim then resetting the the hub in the rim and rewelding. You would be better off to buy the proper backspacing needed. Then you run the risk of having the wheel out-of-round and askew.

Hate to see you get civil suit for wheel being faulty if others and yourself are injured.

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post #7 of 11 (permalink) Old May 18th, 09, 02:03 PM
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Re: Front tires rubbing

Spacers can be used to easily decrease the BS but not to increase it which sounds like something you may need to do. I believe there are companies that will redo the BS (increase the BS on a wheel) but that can get pricey between the work itself and shipping. I would try to determine if it's the fender bolts that are making the contact with the outside of the tire. If so, I would try rounded/flatter bolts as many guys have done here and were able to solve the issue. Some have simply removed the bolts...

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post #8 of 11 (permalink) Old May 18th, 09, 06:34 PM
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Re: Front tires rubbing

My son had the same problem with his 68 it had the FW 15 x 7. I install a set of DF (Z28) ralleys on the front w the 215/65/15 everything works great. But first you may want to check your spindles. If you went from drum to disc you had to change the spindle. Make sure the spindle you used did not move the hub out further.

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post #9 of 11 (permalink) Old May 19th, 09, 08:23 AM
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Re: Front tires rubbing

I believe the "65" tire is too tall and that's why it's rubbing. On my '67, I have 15x7 wheels with 4.5 bs. On the front 215-60-15 with original suspension, drum brakes, no rubbing issues ever.

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post #10 of 11 (permalink) Old May 19th, 09, 08:24 PM
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Re: Front tires rubbing

How good are your body mounts. I have a 67 vert with the Hotchkis TVS kit. I have 15x7 rallys with 245/60/15's with original drums. I was rubbing on the outside of the tire on the fender bolts. I replaced the worn body mounts with polygraphite ones and gained about 1/2 to 3/4" on the front. The tires only rub on hard bumps. You can replace some of the upper fender bolts with a smooth head bolts to give alittle more clearance.

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post #11 of 11 (permalink) Old May 19th, 09, 10:40 PM
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Re: Front tires rubbing

A 15x8 wheel with 4.5" backspace on a 1969 will rub while using P235/60/R15. I would go with P235/60/R15 on stock 15x7 Rally's up front. You can use P215/65/R15 as well. That size was OE on 1982-1987 Z28's & 1985-1990 IROC Z's with the 5.0L engine and can be readily found as well.

***1) The overall diameter of the P235/60/R15 is 26.1 inches
***2) The OD of a P225/60/R15 is 25.62 and that size can be commonly found on late 1980's & early 1990's 5.0L Mustang's.
*** 3) The OD of a P215/65/R15 is 26.0 inches

Circumference: 81.68 in 2074.6 mm for P215/65/R15
Circumference: 80.48 in 2044.1 mm for P225/60R15
Circumference: 81.99 in 2082.5 mm for P235/60/R15


In my experience you can fit more tire on the front of a 1969 than a 1967 or 1968 and you can fit more tire on the back of a 1967 & 1968 than a 1969.

In short: the 15x8 wheel is too wide for the front of your 1969. Go with a 15x7 Rally Wheel with roughly 4.25" back space (no more than 4.50") and the P235/60/R15 will work just fine. That's what I have on my 1969. Car isn't here now for me to double check back space....

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3) 1988 5.7L IROC-Z, sold 1994
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