Wheel and tire size - Team Camaro Tech
Wheels & Tires What fits what?

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post #1 of 34 (permalink) Old Sep 7th, 19, 12:00 PM Thread Starter
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Wheel and tire size

I have a 1969 CAMARO that has front disc brakes(recently added)and rear drum. It had 14 inch wheels on the front and 15 inch on the rear. I ordered a set of rally wheels that are 15x8 with a 4 & 1/4 backspacing and a -6 mm offset. I put a set of Cooper Cobra 245/60/15 tires all around. My problem is the driver side front tire rubs the fender a bit. It actually caught the crome wheel well trim and bent it out. The rear tires are tucked in nicely but the fronts are further out toward the fender.

I知 not a wheel/tire guy so not sure where to go to correct the issue. Back to 14痴 on the front? 15x7 with +6 mm offset wheels? Different size 15 inch tire? I知 truly lost and quite frustrated and would appreciate any feedback. Thank you in advance.
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post #2 of 34 (permalink) Old Sep 7th, 19, 12:12 PM
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Re: Wheel and tire size

Disc and drum use different backspace/offset. 15x8 w/ 4.5" would be better. (centered)

How is the gap on the passenger side ? Guessing its pretty good ?

I'm thinking your subframe may be off a bit ?

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post #3 of 34 (permalink) Old Sep 7th, 19, 12:36 PM Thread Starter
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Re: Wheel and tire size

Gap is better but still tight on pass side. Not rubbing at least

Actually after looking at it again the pass side is tucked nicely. I wonder if classic industries boxed one of those wheels incorrectly. Driver side stick out quite a bit further. Too hot out now, I値l check it out tomorrow

Last edited by 49ermike; Sep 7th, 19 at 01:47 PM.
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post #4 of 34 (permalink) Old Sep 7th, 19, 02:10 PM
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Re: Wheel and tire size

is the front bumper level/ even from bumper to concrete. spring sag?
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post #5 of 34 (permalink) Old Sep 7th, 19, 03:28 PM Thread Starter
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Re: Wheel and tire size

I値l check that too. Thanks👍
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post #6 of 34 (permalink) Old Sep 7th, 19, 03:37 PM Thread Starter
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Re: Wheel and tire size

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Originally Posted by flat tire View Post
is the front bumper level/ even from bumper to concrete. spring sag?
Same
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post #7 of 34 (permalink) Old Sep 7th, 19, 03:39 PM
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Re: Wheel and tire size

Here are the generally accepted correct backspacings for a first gen regardless of diameter. You missed it by a half inch.

17x7 = 4.25"bs
17x8 = 4.75"bs
17x8.5 = 5" bs
17x9 = 5.25"bs
17x9.5 = 5.5" bs

What are your front end alignment specs? You could try to add some negative camber to pull in the top of the tire, roughly -.5 degrees.

Don

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post #8 of 34 (permalink) Old Sep 7th, 19, 04:01 PM Thread Starter
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Re: Wheel and tire size

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Originally Posted by DOUG G View Post
Disc and drum use different backspace/offset. 15x8 w/ 4.5" would be better. (centered)

How is the gap on the passenger side ? Guessing its pretty good ?

I'm thinking your subframe may be off a bit ?
I知 thinking you may be right. How do I check that?
How does one correct that?
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post #9 of 34 (permalink) Old Sep 7th, 19, 04:13 PM Thread Starter
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Re: Wheel and tire size

The more I read other posts with similar issues the more confused I get. 😒
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post #10 of 34 (permalink) Old Sep 7th, 19, 04:16 PM
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Re: Wheel and tire size

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Originally Posted by 49ermike View Post
The more I read other posts with similar issues the more confused I get. 😒
You used wheels with insufficient backspacing. It really is that simple. Difference side to side is most likely a difference in front end alignment imho...

Don

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1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
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post #11 of 34 (permalink) Old Sep 8th, 19, 04:25 AM
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Re: Wheel and tire size

First thing would to be checking sub alignment. (check alignment holes under car at firewall next to the body mounts...5/8's bolt should slip in easy)
Second thing would be panel alignment (just run a string line down both sides to check straight/even on both sides)
Third thing I would do is swap wheels side to side and make sure it's a car issue and not a mismarked wheel

Yes, last alignment ? could be a caster/camber issue ?

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post #12 of 34 (permalink) Old Sep 8th, 19, 09:34 AM
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Re: Wheel and tire size

Quote:
Originally Posted by dhutton View Post
Here are the generally accepted correct backspacings for a first gen regardless of diameter. You missed it by a half inch.

17x7 = 4.25"bs
17x8 = 4.75"bs
17x8.5 = 5" bs
17x9 = 5.25"bs
17x9.5 = 5.5" bs

What are your front end alignment specs? You could try to add some negative camber to pull in the top of the tire, roughly -.5 degrees.

Don

Wouldn't the OP's 15x8 4.25" bs put the outer edge of the rim in the same position as 17x9 5.25"bs and inboard of the recommended 17x9.5 5.5"bs? I suppose putting relatively narrow tires on the rims would make a difference but then why bother going to the wide rims.
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post #13 of 34 (permalink) Old Sep 8th, 19, 10:39 AM
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Re: Wheel and tire size

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Originally Posted by friendlyviper View Post
Wouldn't the OP's 15x8 4.25" bs put the outer edge of the rim in the same position as 17x9 5.25"bs and inboard of the recommended 17x9.5 5.5"bs? I suppose putting relatively narrow tires on the rims would make a difference but then why bother going to the wide rims.
Nope. Out a half inch further. Specs I gave are a fixed +6 mm offset....

Divide the width increase in half when calculating lip position changes.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #14 of 34 (permalink) Old Sep 8th, 19, 11:50 AM
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Re: Wheel and tire size

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Originally Posted by dhutton View Post
Nope. Out a half inch further. Specs I gave are a fixed +6 mm offset....

Divide the width increase in half when calculating lip position changes.

Don

Looks like I'm missing something but that's not new.



I thought of it as an 8" rim with 4.25" bs would be 4.25" inboard of the wheel mounting flange and therefore 3.75" outboard of the wheel mounting flange. A 9" rim with 5.25 bs would be 5.25" inboard of the mounting flange and there fore 3.75" outboard of the mounting flange. Making the outer wheel side have he same position with respect to the mounting surface.
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post #15 of 34 (permalink) Old Sep 8th, 19, 12:22 PM
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Re: Wheel and tire size

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Originally Posted by friendlyviper View Post
Looks like I'm missing something but that's not new.



I thought of it as an 8" rim with 4.25" bs would be 4.25" inboard of the wheel mounting flange and therefore 3.75" outboard of the wheel mounting flange. A 9" rim with 5.25 bs would be 5.25" inboard of the mounting flange and there fore 3.75" outboard of the mounting flange. Making the outer wheel side have he same position with respect to the mounting surface.
You forgot to add an inch to the width for the lip. An 8 inch wheel is 9 inches wide. At least I think that is what you are doing.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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1956 Cameo project - C5 drivetrain
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