Well it depends on the amount of lift your looking at, I fit 30" BFG all terrains on my ranger 4x4 with no lift and fit 33" pro-comps on my buddy's ranger with a 3" lift-(on its way to pre-runner). With a 6" lift and flares theres no reason you couldn't put 35's on it just make sure you get the correct backspace on your wheels or your gonna have rubbing problems however I'm not sure you'd want to go that big, a ton of drag and sh!t gas mileage. 33's look great on rangers in my opinion, good for gas...kinda, a decent sized off road tire for small game and not bad in the cosmetics department. I pulled the 30's off my ranger and went back to stock 235/70/R15's its the 3.0 liter V6 and has no power stock so the 30" BFG's were killing me, However I now drive a 5.9L Dodge Ram Laramie 1500 with 13" of lift-(10" suspension and 3" body) it rides on 35X12.50X15 BFG Mud terrains I also run a set of 35X12.50X17 procomp Xterrain tires on procomp xtreme wheels, looks great and hasn't gotten me stuck yet! just pulled a F150 out of the middle of the desert yesterday actually
I can’t tell the exact what largest size tire you can put on a Ford Ranger. All that I found was a 16x8 or 16x10 body lift & 6" suspension lift will fit 285x75x16, 305x75x16, 315x75x16 tires.Just make it sure again.
31X10.5 seem to be the largest one can put on a stock machine,15" Ford Rim, without doing any modification to the suspension. The only disadvantage is you have to recalibrate the speedometer, which is easy enough to do, or take it to a speedo shop and have them do it.
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