I have an '08 F-150 KR SuperCrw...I am getting a 2.5" ReadyLift level kit installed..what are the biggest tires I can put on my stock 20 inch wheels without having any scrubbing at all? Thanks...

 

I put on LT305/55R20 BFG ATs (33.4 inches tall) on 20x8.5 MB Motoring Predator wheels with positive backspacing and had no issues at all. Some have mounted 35 inch tall tires on stock wheels (or stock backspacing) and have had no problems or only minor trimming.

 

alright..thanks..i don't want to have to do any trimming..nice truck by the way..how much difference is there between a 285 and a 305?

 

a 285/65/20 is a great fitting tire, with almost no rubbing or trimming.

 

Thanks.

In the BFG AT, the LT285/55R20s are 32.5 inches tall and 11.5 inches wide on an 8.5-inch wheel.

The LT285/65R20s are much taller at 34.7 inches tall and 11.5 inches wide compared to the LT305/55R20s at 33.5 inches tall but 12.0 inches wide on 8.5-inch wheels.

If you go with the Mud Terrains, or other brands, you'll get slightly different numbers.

 

285 and 305 is the width of the tire in millimeters.