Tire size help for 68 camaro -Stock wheel well- - Team Camaro Tech
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post #1 of 18 (permalink) Old Nov 21st, 18, 05:32 PM Thread Starter
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Tire size help for 68 camaro -Stock wheel well-

Hey guys, I just got a 68 camaro to build up this winter. I am wondering if 15x8 wheels with 4.25" backspacing will fit in the stock wheel well with 275/60 Radial T/A's. As far as I know the back springs are stock. I have heard that a 15x8 with 4.5" bs will fit with a 275/60, and I would like to know if the 1/4" difference will affect it. And what would be an ideal front wheel size for a 225/60 tire?
Thanks
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post #2 of 18 (permalink) Old Nov 21st, 18, 05:47 PM
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Re: Tire size help for 68 camaro -Stock wheel well-

15x8 w/ 4.5 BS is about perfect....clears all around.


68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #3 of 18 (permalink) Old Nov 21st, 18, 05:55 PM
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Re: Tire size help for 68 camaro -Stock wheel well-

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Originally Posted by cMazel View Post
Hey guys, I just got a 68 camaro to build up this winter. I am wondering if 15x8 wheels with 4.25" backspacing will fit in the stock wheel well with 275/60 Radial T/A's. As far as I know the back springs are stock. I have heard that a 15x8 with 4.5" bs will fit with a 275/60, and I would like to know if the 1/4" difference will affect it. And what would be an ideal front wheel size for a 225/60 tire?
Thanks
Your first problem is the rims are way too narrow for those size tires. A 275 has over 11 inches of tread. Your rims should be within a half inch of your tire size. While the 15x8 would fit in the rear with the backspacing (they are +6 offset), I doubt the tires would and you'll end up with tires that are way higher in the center than the outer tread because of the width difference. A 225 front tire is about 9 inches wide so an 8.5" rim is minimum I would go. I have 235/45R17s on all 4 corners. They are just about stock height, but with a +0 offset barely clear the rear fenders.
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post #4 of 18 (permalink) Old Nov 21st, 18, 06:44 PM Thread Starter
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Re: Tire size help for 68 camaro -Stock wheel well-

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Originally Posted by DOUG G View Post
15x8 w/ 4.5 BS is about perfect....clears all around.

Doug, I have been following your build to base my tire size off of because I love the look of your car. Do you think that 1/4" bs difference would make them not fit?
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post #5 of 18 (permalink) Old Nov 21st, 18, 06:47 PM Thread Starter
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Re: Tire size help for 68 camaro -Stock wheel well-

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Originally Posted by 68lowered View Post
Your first problem is the rims are way too narrow for those size tires. A 275 has over 11 inches of tread. Your rims should be within a half inch of your tire size. While the 15x8 would fit in the rear with the backspacing (they are +6 offset), I doubt the tires would and you'll end up with tires that are way higher in the center than the outer tread because of the width difference. A 225 front tire is about 9 inches wide so an 8.5" rim is minimum I would go. I have 235/45R17s on all 4 corners. They are just about stock height, but with a +0 offset barely clear the rear fenders.
Thanks for the advice. I have only really been working on Japanese cars so these different diameters and widths are new to me. And I have seen Doug as well as others say that that 275/60's are perfect on 8" wide wheels so now I am conflicted
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post #6 of 18 (permalink) Old Nov 21st, 18, 08:18 PM
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Re: Tire size help for 68 camaro -Stock wheel well-

I feel you on the conflict. I have 245/60's on 15x8's right now and want to upgrade to 275/60's (or maybe /50's). The 8" rim does seem narrow. However, for the 275/60, an 8" rim is the measuring wheel width. It is on the lower end of the width range recommended though which is kind of weird. I've seen plenty of guys like Doug say they work. You'll just have more sidewall bulge I guess. I have rally wheels and there's nothing in between 8" and 10" wide. At 10" they start to extend past the fender with stock wheel wells/suspension if that's a concern. I test fit some 295/50's on 15x10's and they rubbed slightly on the inner wheel well. Wish they made 9's..

Please post pics when you decide what to get.

Doug, do you have pics from other angles you could post? What size do you have up front?


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post #7 of 18 (permalink) Old Nov 21st, 18, 11:00 PM
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Re: Tire size help for 68 camaro -Stock wheel well-

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Originally Posted by DOUG G View Post
15x8 w/ 4.5 BS is about perfect....clears all around.

Ditto, I run essentially the same set up as Doug, only on 15x8 rally wheels. Its tight, but fits. A 1/4 may not matter, but I would say its going to rub at some point.

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post #8 of 18 (permalink) Old Nov 22nd, 18, 12:12 AM
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Re: Tire size help for 68 camaro -Stock wheel well-

There's always a bit conflict. 255/60 on 15x8, 4.5bs. Hard to believe a 275 doesn't rub. Depends on the suspension and/or wheel well mods..


On the front, 15x7 4.25bs is ideal for a 225/60 or 215/65. Any size wider tire is borderline. Some folks claim a 235/60 won't rub, so again depends on the suspension I guess.

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #9 of 18 (permalink) Old Nov 22nd, 18, 02:32 AM
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Re: Tire size help for 68 camaro -Stock wheel well-

here is a picture of my 68 with 10" -4.5 back space American racing wheels with 295-50-15 . it has 5 spring leaves. the tire does stick out 1.5" beyond the fender
I also use jagger brothers clip on mud flaps. it also still retains the original BB front springs holding an aluminum headed SB

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post #10 of 18 (permalink) Old Nov 22nd, 18, 03:46 AM
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Re: Tire size help for 68 camaro -Stock wheel well-

Most pics locked up on PB mess...BUT, IF I place a straight edge on my tire to the lip....it is MAYBE a 1/4" gap, so it MAY rub with a 4.25 BS wheel. If you rolled the lip then its not an issue anymore.
Now also remember...your real axle does shift slightly left/right in hard turns.(as well as tire flex)

Up front are some skinnies...205/65/15 on 5" wheels with 2.5" BS....so not much help there


I had some McCreay 285/60/15 SH on there at one time. They were flush with the wheel well and rubbed on bumps/turns....so they had to go (on same wheels)
[[][/[]

see bottom of post....


MT recommends....
Minimum Recommended Wheel Width: 7.50 in.
Maximum Recommended Wheel Width: 9.50 in.
But I know the 275x guys run them on wider wheels





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68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53

Last edited by DOUG G; Nov 22nd, 18 at 04:12 AM.
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post #11 of 18 (permalink) Old Nov 22nd, 18, 07:11 AM Thread Starter
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Thanks everyone! Lots of good information and great looking cars. Soar B-1, I will post pictures on here when I get the wheels on there, but it might be a while (Reworking the whole interior/engine first). Garfields, thanks for the front tire info. I think I will go with 15x8 4.5” bs on the back with 275/60’s just to be safe based on Doug’s measurements. 15x7 4.25” bs 225/60’s up front. Now to decide on wheels...
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post #12 of 18 (permalink) Old Nov 22nd, 18, 08:52 AM
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Re: Tire size help for 68 camaro -Stock wheel well-

Quote:
Originally Posted by cMazel View Post
Thanks everyone! Lots of good information and great looking cars. Soar B-1, I will post pictures on here when I get the wheels on there, but it might be a while (Reworking the whole interior/engine first). Garfields, thanks for the front tire info. I think I will go with 15x8 4.5 bs on the back with 275/60s just to be safe based on Dougs measurements. 15x7 4.25 bs 225/60s up front. Now to decide on wheels...
Rough measurements....


11" from inner wheel well to quarter lip
6" from drum face to inner wheel well
5" from drum face to quarter lip


Based off memory....

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #13 of 18 (permalink) Old Nov 22nd, 18, 01:03 PM
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I run a 275 with 3” drop springs.
No issues.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70 US Gear Lightning r&p
Speedtech torque arm,Ridetech HQ coilovers
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Budnik wheels

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post #14 of 18 (permalink) Old Nov 22nd, 18, 01:43 PM Thread Starter
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Quote:
Originally Posted by DOUG G View Post
Quote:
Originally Posted by cMazel View Post
Thanks everyone! Lots of good information and great looking cars. Soar B-1, I will post pictures on here when I get the wheels on there, but it might be a while (Reworking the whole interior/engine first). Garfields, thanks for the front tire info. I think I will go with 15x8 4.5” bs on the back with 275/60’s just to be safe based on Doug’s measurements. 15x7 4.25” bs 225/60’s up front. Now to decide on wheels...
Rough measurements....


11" from inner wheel well to quarter lip
6" from drum face to inner wheel well
5" from drum face to quarter lip


Based off memory....<img src="https://www.camaros.net/forums/images/smilies/redface.gif" border="0" alt="" title="Embarrassment" class="inlineimg" />
Sounds great. Thanks again.
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post #15 of 18 (permalink) Old Nov 22nd, 18, 01:44 PM Thread Starter
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Originally Posted by ilikeike View Post
I run a 275 with 3” drop springs.
No issues.
Perfect, what wheels do you run?
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