If you get into serious off-roading you are gonna want to keep the smaller rims..... 18's are great for the street or for 49" tires but for what will fit on your rig stay with the 15's... The size gives you more choice in tires, cheaper, and when you air down the tries will have more rubber to surface to hug those stubborn rocks. On my parents RR we run Toyo or Perelli, both have held up great, but we don't go crazy with that rig. Those 18's are pricey tires
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