1969 Front Wheels Rubbing

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Offline Glen Mach 1

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1969 Front Wheels Rubbing
« on: May 12, 2020, 05:18:51 PM »
Wondering if anyone else has this problem.  I have 15x8 Magnum 500 rims with a 4 3/4 in offset and they rub when on full lock to the extent it has taken off the trim once. The rubber is 235/60 R15. These are the same as the back rims and rubber.

Want to know if the problem can be solved with different rubber or do I need to get 15x7 or 15x6 new rims?

Thanks

Glen

Cheers Glen

Offline aussie trev

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Re: 1969 Front Wheels Rubbing
« Reply #1 on: May 12, 2020, 06:32:05 PM »
We need to know were is it rubbing.if it the front .reduced the castor

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #2 on: May 12, 2020, 07:02:26 PM »
It rubs at the front of the wheel arch on the trim.
Cheers Glen

Offline jiffy

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Re: 1969 Front Wheels Rubbing
« Reply #3 on: May 12, 2020, 08:11:37 PM »
I have heard many say that 15x8 is too large for the front.
I have 4 of 15 x 8 and intend to get some 15 x7 to narrow the front to stop this happening.
anyone who has some 15x7 Magnums on the rear and would swap for 15 x 8, let me know. Or the OP.
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Offline barnett468

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Re: 1969 Front Wheels Rubbing
« Reply #4 on: May 13, 2020, 03:07:05 AM »
Wondering if anyone else has this problem.  I have 15x8 Magnum 500 rims with a 4 3/4 in offset and they rub when on full lock to the extent it has taken off the trim once. The rubber is 235/60 R15. These are the same as the back rims and rubber.

Want to know if the problem can be solved with different rubber or do I need to get 15x7 or 15x6 new rims?

Thanks

Glen

Of course that tire will rub with 8" rims, and to get it to not rub with 8" tires, they would need to be so narrow and low profile that they would look dorky. 235,60 15 is the widest setup you can run on one of these without it rubbing, i guarantee it. i have done it a bazillion times.

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #5 on: May 13, 2020, 08:24:31 AM »
To clarify a 15 x 7 rim could still use the 235,60 15R rubber and not rub?

Would I be better to move to a 225 or 215 for the front?
Cheers Glen

Offline aussie trev

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Re: 1969 Front Wheels Rubbing
« Reply #6 on: May 13, 2020, 08:55:49 AM »
I have 15x7 rims with 245/60/15 tyres on my boss all round .no rubbing at all .hope this helps

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #7 on: May 13, 2020, 09:12:54 AM »
OK - So I might be able to keep my current 235/60 15 rubber and replace the rims with 15 x 7 and all should be good.
Cheers Glen

Offline jiffy

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Re: 1969 Front Wheels Rubbing
« Reply #8 on: May 13, 2020, 09:52:54 AM »
Would want to know the answer to that question... AussieTrev- if your car is a Boss then it would have rolled wheel arches on the front fenders, wouldn't it? I think that would help it clear the larger rubber....
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Offline aussie trev

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Re: 1969 Front Wheels Rubbing
« Reply #9 on: May 13, 2020, 10:52:36 AM »
Bosses only have the guards rolled around the top and not the front edge were it hits on full lock.they dont have moulds as u know but that would only acount for few mm. The more caster you put in the less clearance you have .

Offline barnett468

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Re: 1969 Front Wheels Rubbing
« Reply #10 on: May 13, 2020, 11:32:15 AM »
I have 15x7 rims with 245/60/15 tyres on my boss all round .no rubbing at all .hope this helps

unfortunately it does not help only because the wheel lips on your boss are rolled under for extra clearance.

Offline barnett468

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Re: 1969 Front Wheels Rubbing
« Reply #11 on: May 13, 2020, 11:33:16 AM »
OK - So I might be able to keep my current 235/60 15 rubber and replace the rims with 15 x 7 and all should be good.

yes, if the rims have the correct back spacing.

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #12 on: May 13, 2020, 05:18:55 PM »
15x7 have 4 1/4 backspacing where the existing 15 x 8 have 4 1/2...
Cheers Glen

Offline ants

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Re: 1969 Front Wheels Rubbing
« Reply #13 on: May 13, 2020, 09:42:03 PM »
Take out the upper control arms and replace the front bolts with longer ones. Fit 3 or 4, 3mm washers or wheel alignment shims on the front bolt and reassemble. This will move the wheel back and away from the front lip and increase caster at the same time. Will need a wheel alignment after.  I have 15 x 8 Superlites with 26 x 10 x 15 tyres (very close in size to 235/60R15) and no rubbing with the top of the wheel arch rolled.
This is a bit labour intensive but cost very little $$$ as against the cost of 2 wheels.

Offline jiffy

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Re: 1969 Front Wheels Rubbing
« Reply #14 on: May 13, 2020, 10:11:59 PM »
Take out the upper control arms and replace the front bolts with longer ones. Fit 3 or 4, 3mm washers or wheel alignment shims on the front bolt and reassemble. This will move the wheel back and away from the front lip and increase caster at the same time. Will need a wheel alignment after.  I have 15 x 8 Superlites with 26 x 10 x 15 tyres (very close in size to 235/60R15) and no rubbing with the top of the wheel arch rolled.
This is a bit labour intensive but cost very little $$$ as against the cost of 2 wheels.

Are there any engineering complexities with this approach? Where would you get the shims from?
Thanks in advance
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Offline ants

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Re: 1969 Front Wheels Rubbing
« Reply #15 on: May 13, 2020, 10:44:09 PM »
Are there any engineering complexities with this approach? Where would you get the shims from?
Thanks in advance

Engineering issues....no different to putting shims in or taking shims out when wheel aligning an early Holden.
Should be able to get the shims from Repco, Bursons or even a tyre shop. Or get a handful of washers from a fastener supplier when you get the longer bolts. I used washers as they can't fall out should the bolt come loose.

This is what the shims look like
https://automotivesuperstore.com.au/superpro-spf1618-3k?gclid=CjwKCAjwte71BRBCEiwAU_V9h1e34VkSeK7CtypKs0qCR8gnNeYQ9xqcTZss4I2nwbRsYBw3BOLflhoCsDUQAvD_BwE

Offline barnett468

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Re: 1969 Front Wheels Rubbing
« Reply #16 on: May 16, 2020, 10:56:55 AM »
15x7 have 4 1/4 backspacing where the existing 15 x 8 have 4 1/2...

the 15 x 7 will work with 235x60 tires unless they are oversize tires and/or you have repo fenders and/or there is something wrong with your frame or suspension etc.

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #17 on: May 19, 2020, 02:38:02 PM »
Thanks barnett468- I might try the existing tyre 235/60 on the 15x7 first and see if that works.  I had the front drums converted to discs so just wondering if that had an impact...
Cheers Glen

Offline hux

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Re: 1969 Front Wheels Rubbing
« Reply #18 on: May 23, 2020, 09:19:21 AM »
Thanks barnett468- I might try the existing tyre 235/60 on the 15x7 first and see if that works.  I had the front drums converted to discs so just wondering if that had an impact...

Why not just go to a 225/60R15 - cheaper than new wheels and lose 15mm in diameter?

Offline shaunp

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Re: 1969 Front Wheels Rubbing
« Reply #19 on: May 25, 2020, 10:19:06 AM »
Get someone to set the caster with shims, not the bars, this will move the wheel back.

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Re: 1969 Front Wheels Rubbing
« Reply #20 on: May 25, 2020, 11:08:14 PM »
Glen, this may be no help but my car runs 16x8 with 4.0" backspace all round (came to me that way, and yeah, the 16s do mean more limited tyre choices).
Just last week I replaced the >20yr old 225/50 16 Bridgestones with new ones.

It has no rubbing problems. 
I considered going bigger in the rear, either 245/50 or 245/45, but chickened out in case I need in the future, to rotate the wheels for tyre wear.

So the diameter of my wheels is 16" or 406.4mm plus (225 x 0.5) x 2 = 225mm.  i.e. 631mm
Your 235/60 15s have a diameter of 663mm; 32mm taller overall - so 16mm closer to the guards.

While this is significant, I'm wondering if it's actually the backspace that causes the rub.  Or as you've identified, the brake change may have changed the track.

A Roadkill Episode 66 describes putting F:17x8 4.5" backspace, and R:17x9 5" backspace, though that Mach 1 sat higher for whatever reason, but 8" did go on the front with 245/45 17 = 652mm diameter.  Pretty close to the 651mm dia, as hux (Craig) commented on the 225/60 15.


So you've clarified it's the front of the guard, and I presume it's from the outside of the tyre i.e. right turn = front of left guard rubs, or is it from the inside?
Can you post a picture?  Others smarter than I, may then identify it quicker.

I'm interested in how you go with this, I obviously may need it in the future.

(I also found this site is useful: www.tacomaworld.com/tirecalc?tires
Sorry, I don't know if my uploaded picture will work.)

David.
The trouble is, you think you’ve got time.

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #21 on: May 26, 2020, 12:12:47 PM »
Loved that Road Kill episode...

I don't have a picture but the rubbing is from both sides outside tyre on chrome rim guard.  I have got a set of new 15x7 Magnum 500 last night so I'm going to try them with the 235/60 15's today to see if it solves the problem.  It probably would have been smarter to keep the 15x8 rimes and just go for smaller rubber as someone suggested....

Will load up some pics and let you know how it goes.
Cheers Glen

Offline Glen Mach 1

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Re: 1969 Front Wheels Rubbing
« Reply #22 on: May 26, 2020, 12:14:36 PM »
Sorry - my mistake I think the rubbing is from the internal side of the tyre on full lock...  will confirm.
Cheers Glen

Offline 67FBGT

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Re: 1969 Front Wheels Rubbing
« Reply #23 on: May 26, 2020, 01:36:16 PM »
Hmmm... given that the overall diameter of your tyre is about 20mm more than stock, and let's face it a pretty darn wide profile to have up front, I would have thought surely better to change the tyre rather than the rim. As I can't see how a 7" rim in lieu of an 8" would help much, depending on the offset of course, when the tyre is still the same just pulled in a bit at the beads.
In my experience very wide tyres installed up front on Mustangs are notorious for clipping the wheel arch and/or hitting the chassis rail on full lock. Which is also a possibility, have you checked that?
Or try what others have suggested and move the wheel assembly rearwards to compensate.
What's the car like to turn/park with such a wide tyre? Can't be easy.  :bolt:
« Last Edit: May 26, 2020, 07:30:23 PM by 67FBGT »

 

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