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Old 18-07-2017, 07:14 PM
Shan Shan is offline
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Need confirmation on wheel sizing for 1968 Camaro....

Hi Guys,

Buying new wheels for my Camaro.

I know this stuff has been done to death a little, but was hoping for some assistance.

I owned a 1968 Firebird some time ago and the USA owner had fitted 18" wheels. My memory is fading, but I do believe they were 18x8 Fronts and 18x9.5 Rear. I like how they looked.

I did lower that firebird with a 3inch rear drop and recall had some trouble with the 9.5" rears, but did get them to fit with a lower profile tyre, very small shim and minor rolling of the guards.

Previous owner could not remember backspacing on those wheels - so I never knew exactly what they were.

Sooooo.....I am wanting to repeat things a little for my 1968 camaro.

Ideally I would like a 9" wheel in the rear, BUT the wheels I love come in 8" or 9.5" only. So looks like I am going for the 9.5" in the rear again....which was a pain.

I am hoping someone here can confirm I am on the right path with sizing though:

Front = 18x8 wheel with 5" Backspace. Tyre will be 225/40/18
Rear = 18x9.5 wheel with 5.5" Backspace. Tyre will be 265/40/18

Anyone run this combo with a 2" drop front and 3" drop rear?

From my reading - I think I should be ok, but second opinion can't hurt.

Thanks in advance.

Shan
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  #2  
Old 19-07-2017, 10:46 AM
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D4RKSIDE D4RKSIDE is offline
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9.5" fine for the rear with 2 inch drop.

I can measure and let you know my backspacing for the rear.
I can't help you for the front because it is very much case by case. I'm pretty sure my current aftermarket disk setup is different track width to standard or drums. And the C5 upgrade I'm about to put on is different again.
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Old 19-07-2017, 04:27 PM
Shan Shan is offline
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Thanks D4rkside!

Would be very grateful for the clarification.

Yeah - I do know the front is a case by case type of deal. To be honest - even the rears are to some degree depending on how centered the diff is. All cars vary a little.

I am pretty confident on the fronts fitting. Most comments I can find on the web refer to 4.5 to 5" back space with 18" on the front. More backspace being safer given you can add shims for fitting (not ideal, but a means to an end).

I'll be adding a Ridetech tru-turn kit to the front later, so should give me even more clearance on the front once fitted.

Many mention 18" fitting stock fronts ok with tyre sizes larger than I have mentioned. Boze Wheels USA indicate they fit an 18" on a Gen1 Camaro with a 235/40/18, so 225/40/18 I would use is supposedly an even safer bet.

Issue is - backspace comments for the wheels vary on forums and I know guys in the USA have no prob adding shims to fix backspace issues. I know it is a means to an end, BUT ideally - would prefer to avoid if possible. If I could get it right first off - would be happier.

Be grateful for the info on the rears when time permits mate. Your tyre size also appreciated.

Cheers,
Shan
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Old 19-07-2017, 04:37 PM
Shan Shan is offline
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For the record - this is the look I am going for - see attached.

I believe the wheels are from Circle Racing - Series 90's. These are the one's I will be ordering.

This guy was running 18x8 fronts with 245/40/18
and Rears with 18x9.5 with 275/40/18.

So pretty much the same setup as my Firebird had.

I know that that specific Rear wheel+tyre combo results in scrubbing in most cases though. Some more than others depending on the Backspace chosen.

The black camaro did have rubbing issues in the Rear. Owner never posted on how he corrected the problem though.

So yeah - with 9.5 on rears - really important to get the BS perfect.

Cheers,
Shanan

Last edited by Shan; 19-07-2017 at 04:45 PM..
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Old 19-07-2017, 04:44 PM
Shan Shan is offline
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Image is not working I dont think.

Will try again....
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Old 19-07-2017, 05:36 PM
seanj seanj is online now
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68 camaro's have less room in the rear tubs vs 67/68.

Best resource I've found on this one is here for 67s:
http://www.camaros.net/forums/17-whe...re-combos.html

and here for 68s:
http://www.camaros.net/forums/17-whe...re-combos.html

heaps of photobucket issues in that thread now though...
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Old 19-07-2017, 06:15 PM
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These are an old favorite of Camero owners


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Old 20-07-2017, 09:22 AM
Shan Shan is offline
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hahaha.

Now that is something i have NOT seen before.

I wonder where one would buy the penis wheel in 18"?

Not helping my backspace issue though Rodent!

Seanj - thanks - have read those posts (and many, many others). Encountering photo issues (archived, photobucket etc) in a lot of those older wheel threads nowdays...which is unfortunate.
I did not lie when I said I have done a lot of research.....hours in the evenings (on and off over the last month) trawling through posts, searching user names who made comments on stuff and scanning through build threads.

Pretty sure I am on the right track, but hoping guys here can help with that final confirmation.

9.5' rears is definitely going to fit - I know that. Enough people out there running them. You can make it work with the right backspace.
For the Fronts I am pretty sure I got it right, but yeah - hope someone can tell me with more certainty.

I am relying on my memory for some of this and one thing I do know for sure is that my memory is not what it used to be. So relying solely on that is NOT best idea anymore.

cheers,
Shan

Last edited by Shan; 20-07-2017 at 09:33 AM..
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Old 20-07-2017, 11:06 AM
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Suggestion, If you want to maximise the size of the tyre/ wheel combo and your still doing suspension upgrades, leave that decision til the suspension is done.

Or you can buy some less expensive wheels , throw some good tyres on at the dimensions you think now and if you get more space once the suspension is complete , spend the big bucks on wheels.
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Old 20-07-2017, 01:06 PM
Shan Shan is offline
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Hi Booah,

Yeah - I understand what you are saying. I am putting the cart before the horse a little.

I have the opportunity to get these FREE FREIGHT from the USA (need to pay customs clearance), but the savings are too good to ignore unfortunately and it is a time limited offer. Will need to make a decision soon so wheels can be made.

Not an ideal situation, BUT I am not trying to go to crazy on sizing. I am trying to keep it realistic. I know the combination can work as I have run similar myself. Other guys are running it.

Just wish I knew the BS I had previously.

I have no intention of going larger than 8" on front and 9.5" on rear either. Also never going to tubb it either, so later changes to suspension are not going to alter my wheel choice or size. My preferred manufacturer (circle racing) also limits my sizing choices anyway.

Tyre choice may change with suspension, but that is about it I reckon.

FYI - Tru turn kit I want to add to font increases clearances behind the wheel and I checked with Ridetech, 5" BS on front is fine for 8". The "hub face position" with tru turn v's std does not change. Can fit up to 10" with tru-turn apparently (although peeps have mixed results) and with tru-turn can increase the BS if anything. I am not looking to do that though.

Additionally....

I posted on the US camaro forum as well and someone just confirmed 5.5" BS on the 9.5 wheel is the right way to go.

They are saying 4.75 BS could be better for the front though? Eeek.
Although they also said 5" BS for front will also be ok with my safer tyre choice.

So current consensus is 8" fronts will work with 4.75 to 5" BS (depending on tyre choice).
18x9.5 Rears according to my research (and recent comments) is 5.5" BS.

Would love to hear from anyone else though.

Shan
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Old 20-07-2017, 03:58 PM
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68ls1 68ls1 is offline
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Hi

I run on my 68

front 18 x 8 bs 4.75" 245/40

rear 18 x 9 bs 5.375" 275/40

If rear was 9.5", bs 5.5" should be right

We had to make small clearance on rear lips, very little room on inside

http://www.usmuscle.com.au/Forum/sho...38&postcount=1
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Old 21-07-2017, 02:25 PM
Shan Shan is offline
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Hi Roger,

Awesome - thanks for that.
Nice ride btw. Tidy looking unit.

That is the second confirmation for 4.75" BS on front for 8" wheel. If you are clearing the larger 245/40 tyre, then sounds like 4.75" BS is the go.

Do you have the front or rear lowered at all? Looks like you have.

If so - how much drop to you apply?

Last edited by Shan; 21-07-2017 at 03:21 PM..
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Old 21-07-2017, 06:58 PM
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Wiked1 Wiked1 is offline
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Hi these are the back spacing on my 69 camaro Wheels rears 18x9.5 = 5.5" fronts 18x8 4.875 hope this helps
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Old 21-07-2017, 09:00 PM
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Mine has 18x8 with 4.5" backspace. Using 245/40 tyres. That's the front. Rears on mine won't be any good to you.

I've got speedtech suspension but don't think it changed much really. 69 model
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Old 21-07-2017, 11:30 PM
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68ls1 68ls1 is offline
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Quote:
Originally Posted by Shan View Post
Hi Roger,

Awesome - thanks for that.
Nice ride btw. Tidy looking unit.

That is the second confirmation for 4.75" BS on front for 8" wheel. If you are clearing the larger 245/40 tyre, then sounds like 4.75" BS is the go.

Do you have the front or rear lowered at all? Looks like you have.

If so - how much drop to you apply?
Thanks

Front, has ATS spindle with Hotchkis 2" lowered spring , so probably 2.5" lower, rear is DSE 2" with a small spacer block, so also around 2.5"
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