Need new rims on '68 - Team Camaro Tech
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post #1 of 22 (permalink) Old Jul 8th, 04, 01:06 PM Thread Starter
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I will need to buy new rims for my Camaro when I put the disc brake conversion kit on. I will be buying 17" rims but I need help with the width and backspacing.

I like DjD's setup on his '69:

Front 17x8 (4.75bs) on 235/45/17
Back 17x9.5 (5.5bs) on 255/45/17

But I am concerned with rubbing because John Doyle has a 2" drop on his '67 and is using:

Front 17x7 (4.5bs) on 235/45/17
Back 17x8 (4.75bs) on 255/50/17

John says that his rears rub on the inside and the fronts rub on the outside.

For someone who doesn't know much about rims and tires this is beginning to get ugly real fast.

Bottom line, will DjD's rim & tire setup work on my '68 without any problems or do I need to
modify the rim and/or tire sizes?
I don't want to roll my fenders or end up using spacers. My car setup is listed below:

1968 Coupe
Hotchkis lowering springs front and back
Stock drum brakes on rear (10 bolt)
MP disc brake conversion on front

Any help would be greatly appreciated.

Matt<br />68 Coupe - 327 Powerglide
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post #2 of 22 (permalink) Old Jul 9th, 04, 09:50 AM
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67 & 68 Camaros have less wheel well. If you measure from a straight edge on the drum (where wheel mounts)to the inner wheel well you'll only have 6"max, From inner wheel well to lip you'll see only 11". All these measurements are close.

I think 5" would be max backspacing but will still be close/or will hit the shocks and springs.

I know some guys have some wide wheels on 67's & 68's... (but got lucky?)

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #3 of 22 (permalink) Old Jul 9th, 04, 10:59 AM Thread Starter
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Thanks for the reply Doug.

So you would suggest the following?

Front 17x8 (4.75bs) on 235/45/17
Back 17x9.5 (5.0bs) on 255/45/17

Is this also taking the 2" drop into consideration?

Matt

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post #4 of 22 (permalink) Old Jul 10th, 04, 10:28 AM
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I would make a cardboard cut out of the exact measurements,leave the corners square. Do a test for all clearenances. Measure a dozen times if you have to.

25.4mm = 1"

255 = 10.039"wide
.45aspect
17" wheel
26"tall tire by 10"wide.
~~~~~~~~~~~~~~~~~~~~~~~~~~
255 + 10.039"wide
.50aspect
17" wheel
27"tall by 10" wide
--------------------
*235 = 9.25"wide
25.327" tall

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #5 of 22 (permalink) Old Jul 11th, 04, 07:40 PM Thread Starter
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Thanks again Doug!

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post #6 of 22 (permalink) Old Jul 12th, 04, 04:42 AM
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The 255/50/17 is an inch taller than the 255/45/17 and may have a big impact on the rear rubbing on Johns...

...Dennis

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post #7 of 22 (permalink) Old Jul 12th, 04, 07:25 AM Thread Starter
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Dennis,

I was hoping that you would jump in. I love the stance that your car has but this is my first Camaro and I have no idea what the wheel well difference is between a '68 and a '69. By the way, how much did you drop your suspension?

I did see that you and John are running slightly different wheel sizes but wasn't sure if this was the culprit or the wheel well itself.

As you can see in previous posts, Doug doesn't like the 5.5bs and suggests a 5.0bs. Any thoughts?

My initial thought was to get the 17x9.5 (5.5bs) and 17x8 (4.75bs) rims and then mount them so I could figure out my tire size. The theory is that I can avoid rubbing by altering the width or height of the tire such as going with a 245/45/17 which is .35" narrower and .3" shorter.

Like I said before, I am new at this and trying to educate myself as I go. I don't want to make any costly mistakes.

Matt

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post #8 of 22 (permalink) Old Jul 15th, 04, 07:26 AM Thread Starter
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Are you out there Dennis??

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post #9 of 22 (permalink) Old Jul 15th, 04, 08:44 AM
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Hi Matt - thanks for the complement on the stance. My car has hotchkis 2" drop springs up front and 1 1/2" drop leafs in the rear. Even though 69's have the square wheel well opening they have larger tubs behind the opening than 67 & 68's. I only have first hand experience with my '69.

Disk and drum hubs change things a bit so keep that in mind and I think Doug's got the right idea of making templets and measuring carefully. You can get tire dimensions from www.tirerack.com/tires/SearchTires.jsp

Just start from the hub surface (where the pad of the wheel makes contact) and go from there. Using John's 17x7 and my 17x8 as a comparison, At an inch wider only .25" goes inside and .75" goes toward the outside. John says his fronts rub on the outside - given that, my wheels would compound his problem even though the tires are the same size.

...Dennis

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post #10 of 22 (permalink) Old Jul 15th, 04, 09:43 AM Thread Starter
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Dennis,

Thanks for the reply and advice.

I will use Doug's suggestion and try some mock-ups in the wheel well (thanks again to Doug for his input) and see what I come up with.

Wish me luck...

Matt

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post #11 of 22 (permalink) Old Jul 16th, 04, 08:23 AM
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FWIW, we went with the following on our 67 coupe:

235/45 on 17x7 w/ 4.25 front
255/45 on 17x8 w/ 4.75 rear

And here's what it looks like with the stock suspension...



As you can see there's still plenty of room to drop the front about 2-inches, which I plan on doing in the next few weeks.

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post #12 of 22 (permalink) Old Jul 26th, 04, 02:17 PM
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Quote:
Originally posted by DjD:
Hi Matt - thanks for the complement on the stance. My car has hotchkis 2" drop springs up front and 1 1/2" drop leafs in the rear. Even though 69's have the square wheel well opening they have larger tubs behind the opening than 67 & 68's. I only have first hand experience with my '69.

Disk and drum hubs change things a bit so keep that in mind and I think Doug's got the right idea of making templets and measuring carefully. You can get tire dimensions from www.tirerack.com/tires/SearchTires.jsp

Just start from the hub surface (where the pad of the wheel makes contact) and go from there. Using John's 17x7 and my 17x8 as a comparison, At an inch wider only .25" goes inside and .75" goes toward the outside. John says his fronts rub on the outside - given that, my wheels would compound his problem even though the tires are the same size.
Absolutely! Dennis is right.

With the '67 '68 round wheels, you also need a fairly tall tire to fill the well (unless you really slam the car). The '69's squared off wells and almost every other cars dropped or squared wells will look better with a shorter tire than the '67 '68 will.

Be careful when measuring, with the larger wheels, they look best when the top of the well is a little above, at or just below the tire height.

The Blue Camaro above is a perfect example. It's a beautiful car, but it needs to sit down in front at least 2" (I'd guess more, but I also think those are probably brand new stock springs or even a heavier duty spring, a 2" lowering spring as the owner mentioned would probably do the trick). Still a very nice car that will only look better when dropped in front.

You're better of on a '67 '68 going with 7" and at least 4.5 " back space up front. I removed my bolts, trimmed back the well trim and the rubbing is now rare. I do have discs up front, which push out the wheels a bit. Other wise, you'll get major rubbing and have to mod the wheel well or change out the A arms to correct it.

On the rears, the 8" 4.75 bs works good. I do have minor rubbing (actually more like a polishing... the paint and tire are just slightly shiney, I'm sure this could be cured with a 1/8" spacer or washer. it's not really that serious, I'm just making the point that I doubt any more back space will work).

On a stock '67 '68 car, these are the largest you can go with out jacking up the car or doing mods, IMHO. [img]graemlins/thumbsup.gif[/img]

John

'67 RS/SS 350
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post #13 of 22 (permalink) Old Jul 28th, 04, 08:23 AM Thread Starter
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John,

Thanks for your input. Your setup is as follows:

Front 17x7 (4.5bs) on 235/45/17
Back 17x8 (4.75bs) on 255/50/17

I was thinking about adding a bit more backspace to the front (4.75) and shaving the tire size down a bit (45 series) in the back. What do you think about this setup?

Front 17x7 (4.75bs) on 235/45/17
Back 17x8 (4.75bs) on 255/45/17

Same setup as the blue car above except for the back spacing on the fronts.

Matt

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post #14 of 22 (permalink) Old Jul 28th, 04, 10:46 AM
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Sounds perfect.

The rear tires will be 26" tall. IMO, you'll want to get that rear down. Perhaps you could go with the Hotchkis 3 leafs to do this.

Do you have disc brakes?

Post a pic when you get them on.

John

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post #15 of 22 (permalink) Old Jul 28th, 04, 11:46 AM Thread Starter
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John,

My setup will be this:

1968 Coupe
Hotchkis lowering springs front and back
Stock drum brakes on rear (10 bolt)
MP disc brake conversion on front

I found a pic of the same tire and rim setup over at touring-classics.com that you can check out. He is also running Hotchkis front and rear.

http://www.touring-classics.com/Testvehicles.htm

Is that kind of what you were talking about with regards to the tire placement in the wheel wells?

I think it has a nice look to it.

Matt

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