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Author Topic: Rear tires  (Read 342 times)

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Offline txnnny

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Rear tires
« on: May 08, 2020, 12:59:31 AM »
Anyone know the widest tire that will fit under the rear of my 72 Runabout?

Offline Wittsend

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Re: Rear tires
« Reply #1 on: May 08, 2020, 03:09:24 PM »
It is more than the "Widest" tire that fits. The wheels need to have the appropriate width associated with the tire. Wheel backspacing is another factor. The center section of the wheel needs to be properly positioned as the center of the wheel well and the outer end of the brake drum can be in different locations. This often requires an offset known as backspacing. There is also consideration of body roll in corner, as well as bump aspects in the vertical motion. Both can contribute to the tire rubbing on the wheel well, or wheel opening. And, if clearances are tight tire flex can also rub on the suspension.

That all said there are others here who have wide tires and can better get you close to an appropriate answer. Hopefully someone else will chime in.

Offline 71pintoracer

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Re: Rear tires
« Reply #2 on: May 08, 2020, 06:16:44 PM »
That's a very broad question. Are you going to use 13? 14? 15? Something else? I had 205/50/15 on my '71, it was lowered 2" and they never touched.
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Re: Rear tires
« Reply #3 on: June 24, 2020, 07:13:13 PM »
Anyone know the widest tire that will fit under the rear of my 72 Runabout?

It depends on the wheels and backspacing, of course.  Now....that said, I'm running a 235/60 15 tire (Mickey Thompson ET Street Drag Radial) on a set of 7" wheels spaced for a Fox body Mustang.  However, I was just under the car with a tape measure and I think a 255/60 15 will fit on those same wheels.  If I had different wheels, or thought spacers were a good idea, I'm pretty sure I could get a 275 under it.  The limiting factor is distance between the inboard sidewall and the leaf spring.
1972 "Hoonabout"
SBF swap
8" rear 4.11 posi
G-Force 5 Speed
10 point rollcage
Single stage NOS Cheater system

275 rwhp 350 lb/ft on motor.....some thing a bit more than that on the spray.