Tire size - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 12-20-2017, 01:49 PM Thread Starter
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Tire size

What is the largest tire you can fit on a stock 2017+ super duty with 20 wheels with no rubbing


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post #2 of 14 Old 12-20-2017, 03:18 PM
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35" tires.



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post #3 of 14 Old 12-20-2017, 05:11 PM
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Are you able to run 35's without rubbing if on 18" rims?
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post #4 of 14 Old 12-20-2017, 06:26 PM
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Are you able to run 35's without rubbing if on 18" rims?
yes. 285X75R18
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post #5 of 14 Old 12-20-2017, 09:47 PM Thread Starter
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Will a 35x12.5x20 fit or is it too wide


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post #6 of 14 Old 12-21-2017, 05:10 AM
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Will a 35x12.5x20 fit or is it too wide


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I have slight rubbing at full lock with 35x12.5r18


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post #7 of 14 Old 12-21-2017, 03:05 PM
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My issue is this (from an admittedly anal-retentive sort)... Yes, you can put a 35 X 12.5 X 20 on a stock wheeled truck. (I saw a truck with 37 x 12.5 x 20 on a 2017 F-250 yesterday. That said, 35" wheels are meant to be mounted on wheels not less than 8.5" wide - 11" wide (10" being optimum). I think the stock wheel is 8" wide. While people are doing it, I think it looks silly to have sidewalls tucked in tight on a wheel that is really too narrow for the tire, not to mention the "crowning" wear by virtue of the tread not sitting in uniform fashion on the pavement. I am leveling mine and installing 20" x 9" American Force alloy wheels, and am still concerned about this concept, albeit less than the scenarios I detailed above. The whole "tucked in" side wall looks like cr-p IMHO. Again, this is my opinion only...

AND this effect is exacerbated with 20" wheels, as the distance from the wheel edge to the tread is that much shorter than a 17" or 18" wheel, thus making the sidewall "suck in" at an even steeper angle to fit inside the wheel...

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post #8 of 14 Old 12-21-2017, 03:50 PM
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My tires recommended 8-10 wide rims. They are 18s though. Not sure of how much a difference that makes.


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post #9 of 14 Old 12-21-2017, 03:58 PM
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My tires recommended 8-10 wide rims. They are 18s though. Not sure of how much a difference that makes.
Yes, in fairness, I'm quoting recommendations for 20" wheels. With 18" wheels, the sidewall doesn't have the same compression over such a short distance, so I can see width specs as different from 20s.
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post #10 of 14 Old 12-21-2017, 08:21 PM
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Originally Posted by GARBAJ View Post
Yes, in fairness, I'm quoting recommendations for 20" wheels. With 18" wheels, the sidewall doesn't have the same compression over such a short distance, so I can see width specs as different from 20s.
Makes sense. Gotta check the tire manufacturer website.


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