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What's the widest tire
#1
runninpony 
So I'm curious to what is the widest rear tire you guys have fitted on your cars with out tubing or back halfing ether as well as wheel specs you used to reach the width you guys have pics will help as well thanks guys
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#2
Sadittyf;247952 Wrote:So I'm curious to what is the widest rear tire you guys have fitted on your cars with out tubing or back halfing ether as well as wheel specs you used to reach the width you guys have pics will help as well thanks guys

I'm running 285/40/18 Nittos on 18x9 US Bandit rims. 5.25" backspace with plenty of extra space to go wider with the right backspacing.

1973 Mach 1, Porsche Guards Red, 429/C6
1972 Mach 1, Grabber Blue, 302/C4, currently under construction
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#3
I believe Jeff is running 315's?

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#4
I've fit 315-35-17's on 17x10.5's with 6.66 inches of backspacing and I haven't even rolled the fender lips. I'm , running 5 leaf 200 pound leaf springs in back.

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#5
... And here's why the right backspacing is important.

These are 295/50R15s on 15x10 Cragar S/Ss with 4.25" of backspacing.

[Image: attachment.php?aid=26732]

While they look really cool just sitting there...

[Image: attachment.php?aid=29130]

[Image: attachment.php?aid=27993]

... they scrub the outer lip on just about everything - even with the 5-leaf spring pack, new shocks and bushings. I want a just little bit of boost in the back (the old school look works for me) so I'll be installing some factory-style 1-inch shackles, but the only way to make sure there are no rubs is to change the backspacing to get them tucked in a little tighter. Cragars (and most other rims) can be ordered with custom backspacing and/or offsets, so that's the way to go when it comes to stuffing the big rubber under there.

Some of the other guys have similar set-ups with better backspacing and report no issues. I think 5" of backspacing is about the least amount you want with 295s on 10" rims, but 5.25" or even 5.5" would be better. Another guy has 6.5" on his, and they fully tuck, but he said he had to modify the inner wheel houses to clear.

The fronts are 245/60R15s on 15x8s, BTW. No issues whatsoever.

Hope this "example of what not to do" helps someone avoid an expensive mistake in the future. Cool

Eric

[Image: mach1sig2.gif]
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#6
Thank you guys a lot I have a huge thing for perfect near perfect fitment on wheels and tires I like to fit the max width I can with out to much rubbing at full lock I love big wide tires my goal is after I get the 69 quarter panels mounted I hope to run a 325 rear tire but I'm hoping with the right backspacing and the extra width I get from the quarter panels I hope I cross honestly get a 355 tucked nicely in the rear
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#7
Mister 4x4;248003 Wrote:Some of the other guys have similar set-ups with better backspacing and report no issues. I think 5" of backspacing is about the least amount you want with 295s on 10" rims, but 5.25" or even 5.5" would be better. Another guy has 6.5" on his, and they fully tuck, but he said he had to modify the inner wheel houses to clear.

The fronts are 245/60R15s on 15x8s, BTW. No issues whatsoever.

I am subscribing to this thread. This is one of my upcoming expenses for next year. Excellent information Eric. Second response of the day that comes at the right time for me. 295s and 245s on 15s look like a great combination to have.

        [Image: 20160929_171923_edit2_small.jpg]

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
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#8
Modifying the inner fenders(against the frame rails) can be done with a hammer and about two minutes per side. Not much, but I felt the need to mention it.

[Image: Magnum500s011.jpg]

Mike
__________________________________
Black 1985 GT
Yellow 1973 Mustang Mach 1
Black 2012 5.0 GT, 6-speed, Brembo brakes, 3.73's
Wimbledon White 1966 F-100 Shortbed Styleside, 390ci, Tremec 3550, FiTech EFI
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#9
I was pretty sure that's what you said you'd done, but I figured you'd chime in with a pic of your awesome car and its big ol' fat meats. thumb

Eric

[Image: mach1sig2.gif]
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#10
It'll be a week or so before I get them and a few more days before they are mounted, but I intend to fit M&H 325-45-17's to the rear of my car. This will not only be wider but a 28" tall tire as opposed to the current 26" height.

And for shits and giggles, I now have my 255's on the front of the car. I've got about a 1/2 clearance to the upper balljoint and no rubbing at all.

With manual steering, parking lots are now my number 2 sworn enemy!

[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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