I want to get some 33 or 35in tires put on the stock rim, What is the width, 12.50?

33X12.50R20 Would that fit?

 

Also what is the lug pattern, if i was to get rims?

 

Didn't you already make a post about this yesterday or earlier today? Double post???
I had already stated that the stock 20" wheels come with 33" tires already!
5x5.5 pretty sure. and 9" wide

 

the stock rim size is 20x9 on 5x5.5 with a 275-60-20 tire which is about a 33x10.8x20 tire. the 33s should fit because the truck clears 33s no problem but 12.5 width may need a spacer/adapter so they do not rub the upper control arm. I have 275-60-20 toyo open country at's and they are about 1/4 inch from upper control arm. the 35s will not fit stock. also 35s generally do not fit with stock rims unless wheel spacers/adapters are used to push the tire away from the upper a-arm and a leveling kit to add some more clearance. some guys have to do a little trimming so the tires do not rub. While i am no expert ive seen this questions posted soo many times. do a search and youll find your answer pretty quick.