Front tire rub, 67 Camaro - Team Camaro Tech
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post #1 of 15 (permalink) Old Dec 10th, 10, 02:59 PM Thread Starter
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Tim
 
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Front tire rub, 67 Camaro

Would appreciate any help here guys. I'm nearly done restoring the 67 camaro. I changed the front end from drum to disc brakes. I've been told that that increased my backspacing automatically? (depending on the brand of conversion kit). Anyway, I can not completely turn the front tires due to a rub on the back lip of the fender (corner closest to the ground). This is only rubbing on the back of the tire, and hits very close to the sidewall(outside of tire). I'm running 18 x 8" rims, 225/40/18 tires. Any ideas on what is going on here? did the disks push the tires out too much? The car should be sitting at stock height, as I did not lower it, but did put big block coil springs under it. (some say this is best because over time they sag) Thanks for your help!
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post #2 of 15 (permalink) Old Dec 11th, 10, 08:07 AM
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Re: Front tire rub, 67 camaro

Quote:
Originally Posted by tvinton View Post
Would appreciate any help here guys. I'm nearly done restoring the 67 camaro. I changed the front end from drum to disc brakes. I've been told that that increased my backspacing automatically? (depending on the brand of conversion kit). Anyway, I can not completely turn the front tires due to a rub on the back lip of the fender (corner closest to the ground). This is only rubbing on the back of the tire, and hits very close to the sidewall(outside of tire). I'm running 18 x 8" rims, 225/40/18 tires. Any ideas on what is going on here? did the disks push the tires out too much? The car should be sitting at stock height, as I did not lower it, but did put big block coil springs under it. (some say this is best because over time they sag) Thanks for your help!
Converting to discs will push your wheels outward about 1/4",depending on make...sounds to me as if you don't have enough backspacing built into your wheels...which may be a problem.

Do you know what the b/s on your wheels is,it's pretty easy to measure with the wheels off.My guess is they're 4.5 inches in which case that won't be enough.

Sometimes,the fender bolts will rub but usually,it's the one in the center that get's in the way.Check the inner fender and see where exactly it's making contact and if it is that rear lower bolt,remove it and see if that helps you,sometimes that's all it takes.

Good luck and post some pics if you can so we can better understand...

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post #3 of 15 (permalink) Old Dec 11th, 10, 09:02 AM Thread Starter
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Re: Front tire rub, 67 camaro

Thanks for your reply musclecarjohn. To answer your question, the rims have 0mm offset, which I was told means zero backspacing. I've attached some pictures, please let me know what you think. These show exactly where the tires are rubbing. If anything, do you suppose that the 8" wide rim is too much? But I love these rims, and they Iroc doesn't make a 7" version.

Last edited by tvinton; Mar 10th, 12 at 09:53 AM.
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post #4 of 15 (permalink) Old Dec 11th, 10, 09:12 AM
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Re: Front tire rub, 67 camaro

backspacing is your problem, in order to run an 8" wheel, you need to have approx. 4.75 to 4.875 of backspace. With the proper bs, you can run a 245/40 on the front.

Steve
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post #5 of 15 (permalink) Old Dec 11th, 10, 09:20 AM Thread Starter
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Re: Front tire rub, 67 camaro

Steve, I believe that you are recommending that I increase the backspacing? Were you able to look at the pictures of where the tire is hitting? If I were to bring the tire out even further, wouldn't it hit even more??
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post #6 of 15 (permalink) Old Dec 11th, 10, 12:27 PM
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Re: Front tire rub, 67 camaro

Try putting some flat washers between the rim and disc. Add about a 1/4" to all the studs. Then turn your wheel and see if it helps.

You could try a 1/8" then 1/4". Dont drive it with the flat washers in place.

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post #7 of 15 (permalink) Old Dec 11th, 10, 01:49 PM
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Re: Front tire rub, 67 camaro

Backspace actually moves the wheel inboard, not push it out!

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post #8 of 15 (permalink) Old Dec 11th, 10, 01:53 PM
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Re: Front tire rub, 67 camaro

Here is an 18x8 on my car with a 4.75" backspace, 245/40 tire...




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post #9 of 15 (permalink) Old Dec 11th, 10, 02:42 PM Thread Starter
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Re: Front tire rub, 67 camaro

Mike/Steve, I just got done adding 3 washers (1/4") btwn the rim and the disc...and as I suspected, it is rubbing the fender even worse when I turn. Any more ideas?
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post #10 of 15 (permalink) Old Dec 11th, 10, 03:42 PM
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Re: Front tire rub, 67 camaro

You need more backspacing, to bring the tire in, not washers bringing tires out.
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post #11 of 15 (permalink) Old Dec 11th, 10, 03:58 PM Thread Starter
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Tim
 
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Re: Front tire rub, 67 camaro

John, not to sound like I know it all.......but are you sure that more backspacing brings the tire in? I'd LOVE to bring my tire "in." So....what would you suggest doing?
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post #12 of 15 (permalink) Old Dec 11th, 10, 04:14 PM Thread Starter
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Re: Front tire rub, 67 camaro

John is right, more backspacing brings the tire in. Now how do I do that? I wonder if the manufacturer would create more backspace on the rims that I have for the front? Or if there is a company that could safely do that for me?
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post #13 of 15 (permalink) Old Dec 11th, 10, 11:10 PM
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Re: Front tire rub, 67 camaro

That tire seems to be sitting too far back in the wheel well. I have a tire the is only .7" diameter less and I have about 3" of space where that tire is rubbing on a basically stock height front spring.

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post #14 of 15 (permalink) Old Dec 12th, 10, 06:57 AM Thread Starter
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Re: Front tire rub, 67 Camaro

Thanks Larry, is the 3" gap measured when the tires are straight? How could a guy correct that?

Last edited by tvinton; Dec 12th, 10 at 07:23 AM.
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post #15 of 15 (permalink) Old Dec 12th, 10, 10:10 AM Thread Starter
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Tim
 
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Re: Front tire rub, 67 Camaro

Larry, after your input, I decided to measure my gap there when the wheels are straight. I'm looking at 2.5", so with you having a slightly smaller tire, I'm thinking I'm ok there. What I've decided to do is look into 7" rims instead of 8's for the front. I'll keep you posted, and thanks anyone for the additional advice.

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