what is the biggest tire that can be ran on the factory 20's? I have heard all kind of different opinions!
Thanks!

 

you can run any size tire you want on there, making it fit is another question. i would stick to a 12.50 wide or narrower though.

 

What he's saying is a 37x12.50-20 will fit the OEM 20x8.5 inch wheels. The quesion is what are the specs on the truck the tire/wheel is gonna be mounted on?

 

if my research is correct, these are 20x9 factory can I get a 33x13.50 to work?

 

the stock rims are 20x8.5. i personally feel that is too wide of tire for that rim, ideally that should be put on a 20x10 rim. you can put them on there, but they will wear prematurely.

 

Could you give a little info on your truck? Is it a 4x4? 4x2? Stock height or lifted?

 

Stock rim on stock truck with no suspension modifications = 305/55-20

 

If it's a 4x4.

 

my truck is a 2005 FX4 screw with a rough country 2.5 leveling kit, 20" wheels are off a 2007 FX4

 

325/60/20 seems to be the biggest ive seen on the stockers! Man they sure do look good to

 

A 325/60-20 is basically a 35x13.00 tire. That may rub the upper ball joint because of the OEM 20's backspacing. A lot of that will depend on the tire's tread and sidewall design. Aggressive MT's will be worse than most AT's. I'd go with a 35x12.50 at the most.

 

ok, my #1 choice of tire is the Mickey Thompson ATZ, so I will stop looking at the 35x13.50 and start looking for 12.50's