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Whats the biggest size tire i can fit on my stock 2011 F350 FX4. I will be using the stock 20" rims as well. Was thinking 285/65/R20 or 325/60/R20. I don't want any rubbing. Thanks for the help and feedback...:icon_ford::icon_ford::icon_ford:
 

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I don't think you can run anything wider than 285. That's 11.5", a 325 is a bit wider than 12.5". Somebody else will chime in soon.
 

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I ran 325/60R20 wrangler duratracs with a slight rub at full left turn. So a 285 should be just fine
 
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