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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Tire size Question

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Old Aug 30, 2014 | 08:56 PM
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Talking Tire size Question

I have 86 F250 diesel with stock wheels and stock ride height. How big can I go with tires without having to lift.
 
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Old Aug 30, 2014 | 09:02 PM
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Depends on what you can live with. I just pulled 31 x 10.50's off and there were rub marks on the radius arms, caused by it rubbing at about 3/4 lock. I put 30 x 9.50's on and there is no rubbing.
 
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Old Aug 30, 2014 | 09:44 PM
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If you get aftermarket rims, it makes a difference also. They usually stick the tire out farther from the truck, helping rubbing issues. I would not put a very wide tire on a stock rim anyway. It wears out the middle of the tire, the stock rims are usually only 6 inches wide.
 
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Old Aug 30, 2014 | 09:49 PM
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cool thanks
 
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Old Aug 30, 2014 | 11:13 PM
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Depending on what you consider fitting, you can do a 35, it will rub things at full lock but 99% of the time it will be fine. A 33 is a decent fit.
Again, an aftermarket wheel is a very good idea.
 
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Old Sep 1, 2014 | 02:08 AM
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33x12.5 is the biggest you can go at stock height without rubbing. 35s will fit but rub at 3/4 of a turn. You'll need aftermarket wheels for 12.5's.
 
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Old Sep 1, 2014 | 02:10 AM
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a f250 shouldnt have radius arms. should be leafs
 
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Old Sep 1, 2014 | 07:13 AM
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Originally Posted by Skip1970
a f250 shouldnt have radius arms. should be leafs
True, but the effect is the same - too wide will rub on leaf spring.
Also be sure to consider the effect larger diameter tires have on the gearing. Bigger tires = less gearing.
See:Differential Gear Ratio Chart - Tire Size to Gear Ratio
 
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