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Author Topic: Staggered tire sizes - 215/225  (Read 2364 times)
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ITHERTZ
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« on: November 02, 2011, 06:54:57 AM »

Does anybody run 215/60/15s up front and 225/60/15s in the rear?  I have Torq Thrust 15x7 with 3.75 backspacing.  Front disc brakes (single piston type) and rear drums.  I plan to use stock suspension with GT front springs.  My front fenders are already slightly rolled by a previous owner.

I'm looking to go larger than the current 205s all around that I have now - Any reason why the above setup may not fit or rub???



« Last Edit: November 02, 2011, 07:54:15 AM by ITHERTZ » Logged

sfm6s1506
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« Reply #1 on: November 02, 2011, 08:08:04 AM »

I run 225-60 all around with no issues. I did do a fender roll on front passenger fender as it was rubbing slightly. The car handles wonderful. I did the 1 inch lower in front also....

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stickshift
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« Reply #2 on: November 02, 2011, 09:47:07 AM »

The front of the car will sit lower with the 1" UCA drop and as a result there will be less clearance. I believe there was a service bulletin issued for the '65 Shelbys over this and the bulletin recommended rolling the fender lips.

I saw BFG GR50-15s on 67 Shelby 10 spokes on Jeff Burgy's 66 GT350. I'm very sure 235-60-15s will fit as a radial and very sure you will need to roll the lips.

You might want to think about either the shortened front linear race springs or progressive rate ones now at this point. Simply stated, if you reduce the roll, you will reduce the necessity for more fender clearance.

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SFM5S000
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« Reply #3 on: November 02, 2011, 10:41:15 AM »

Troy,

I run 225/60-VR15 mounted on even bigger 15x8 with a 4 3/8 back spacing PS Engineering wheels all the way around. They clear with no issues (photos in my gallery) I can even take larger 235/60-15 or 245/50-15 tires if I can find some decent ones. I also run stock Mustang 4 piston KH calipers in the front and 11x2 1/4 larger rear drums. Phil Schmit told me I would not need to roll my fenders with his wheels if i stayed with 225's or 550x15's.

~Earl J

« Last Edit: November 02, 2011, 10:43:01 AM by SFM5S000 » Logged

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ITHERTZ
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« Reply #4 on: November 02, 2011, 12:06:42 PM »

My Torq Thrust D's have 3.75" backspacing.  I do not want new wheels.  Just trying to figure out if tires will rub with this limited backspacing.  215/60/15 up front with Shelby Drop and GT springs.  Rears 225/60/15 - don't want to hit/rub the inner quarter - again only 3.75 backspacing on a 15x7 wheel - '57 Ford 9 inch Rear end.

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« Reply #5 on: November 02, 2011, 03:36:50 PM »

ITHERTZ,

My 1965 has 15x7-inch Torq Thrust D wheels with 215s at all corners ... and things are fairly tight. In fact, sometimes the rear fender lips would hit the tires ... so I had a mild rolling of the rear wheel lips done. Unless my wheels' offset is somehow different (unlikely), I don't see how a set of 225 or 235 tires would fit without rubbing.

As for the whole staggered tire concept, I kinda like this setup (see photo). Don't worry about rolling the rear fender lips with this sweet setup as before long the rear tires will do the job for you. However, don't forget the set of 10-inch long rear shackles (arrow).



* staggered tires.jpg (64.29 KB, 626x397 - viewed 69 times.)
« Last Edit: November 03, 2011, 04:27:59 PM by Kiwi » Logged
Bigfoot
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« Reply #6 on: November 02, 2011, 04:21:25 PM »

Troy
235-60's rear
215-60's front on stock cragars.
No rubbbing.
I don't think I have any spacers or anything on there.
It's been a while since I've pulled one.

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Kiwi
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« Reply #7 on: November 02, 2011, 04:24:37 PM »

Biggie,

Is the backspacing of the stock Cragar wheels the same as the American Torq Thrust D's? That's the big question of the day.

Note: It's quite unlikely that you would have spacers on there as it would only worsen the lip-rubbing problem.

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Bigfoot
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« Reply #8 on: November 02, 2011, 04:36:48 PM »

1. I don't know but someone here will.
2. You are right.  But i have no tire on metal  issues. It's been a long day. I have spacers on some cars to clear the "hat" on the rotors.  Not the 65 tho. My bad.



« Last Edit: November 02, 2011, 04:42:51 PM by Bigfoot » Logged

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« Reply #9 on: November 02, 2011, 04:40:04 PM »

I bet StickShift would know the wheel answer.
Or Dave
Or Randy
Or Brant
Or Jim
Maybe one of them can chime in.



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« Reply #10 on: November 02, 2011, 05:29:54 PM »

I have Torq Thrust 15x7 with 4.00 backspacing (additional .25 machined off standard backspace of 3.75) running 215/60/15s front and rear with absolutely no rubbing problems over 22 years of street and track driving.  620 lbs springs up front with lowered A-arms and stock 4 piston K-H calipers.  Original leaf springs in the back.  I have contemplated for years moving up to 225/60/15s all the way around but have yet to make the move.




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Bigfoot
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« Reply #11 on: November 02, 2011, 05:55:15 PM »


I saw BFG GR50-15s on 67 Shelby 10 spokes on Jeff Burgy's 66 GT350. I'm very sure 235-60-15s will fit as a radial and very sure you will need to roll the lips.


Slightly O/T but.....
I've seen 275-50's in the back on a 67 Shelby with no rubbing at all.
Looked awesome.



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SFM5S000
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« Reply #12 on: November 02, 2011, 06:55:11 PM »


My 1965 had 15x7-inch Torq Thrust D wheels with 215s at all corners ... and things are fairly tight. In fact, sometimes the rear fender lips would hit the tires ... so I had a mild rolling of the rear wheel lips done. Unless my wheels' offset is somehow different (unlikely), I don't see how a set of 225 or 235 tires would fit without rubbing.


This is what a 4 3/8 back spacing will give you. Thatís a 225/60 on a 15x8 PS Engineering Trans Am wheel, it looks almost too skinny.  I did have the lips rolled even though it wasnít really necessary.  I can now fit up to a 245/50 or a 700/15 with ease in the rear this is also with a Standard 65 Mustang 9 inch rear end nothing fancy. Most of the West Coast Vintage guys run track with these wheels
~Earl J




* DSCN6028.jpg (68.88 KB, 800x600 - viewed 93 times.)
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« Reply #13 on: November 02, 2011, 07:38:40 PM »

Earl,

Those vintage Goodyear Gatorbacks are sooooo boss (Bigfoot, don't go getting all excited as I said boss ... not Boss). My dad used to run a set of those on his BRE-like Datsun 510. Suh-wheat!


Question for you Mssr. SFM5S000 ...

Was it fairly easy to machine the inside mounting flange of the Americans to shave off a tad? I wouldn't mind doing such to tuck my wheels in just a bit to be able to fit a 225 or 235 tire without any fear of rubbing.

I've had extremely good luck with BFG g-Force tires ... so I was thinking of going with a set of these ... http://www.tirerack.com/tires/tires.jsp?tireMake=BFGoodrich&tireModel=g-Force+Sport&partnum=26VR5GFSPV2&vehicleSearch=false&fromCompare1=yes

« Last Edit: November 02, 2011, 07:45:45 PM by Kiwi » Logged
SFM5S000
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« Reply #14 on: November 02, 2011, 07:52:52 PM »


Was it fairly easy to machine the inside mounting flange of the Americans to shave off a tad? I wouldn't mind doing such to tuck my wheels in just a tad to be able to fit a 225 or 235 tire without fear of rubbing.


Hi Kiwi,

Those wheels were not re-machined. I ordered them as you see them. The only deviation from from how PS Engineering sells them is I requested the fill valve on the angle and not between the spokes. He has a number of finish options. I have a set of 5 (one for the spare under the rear window).

Hereís an alternative to the Phil Schmit wheels. You may have to dig a little deeper in your pocket. (these are for the other 1%....lol)  I think these guys used the PS wheels for their mold but casted them in magnesium instead and will do just about any back spacing you want. Vintage Engineering is right here in the SF bay Area. Nice stuff.

http://www.vintageeng.com/MagWheelsProduct.html

Cheers,
~Earl J

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