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It seems like most people run a 17" or 18" wheel to get bigger tires to fit. I think I want to stay with a 20" wheel, but would like to get a more aggressive AT tire. Does anyone know what the max size 20" tire will fit without major modification. Im not going to do any serious offroading, maybe some overlanding type stuff, so I dont need anything too extreme.
Depends on your definition of "major". You can get 35s to fit fairly easily with some adjustments to the plastic and a body mount chop. 33's fit with just minor adjustments to the plastic.
The wheel diameter has little to do with bigger tire size other than tire size availability.