What tires for 18" FX4 rims?
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I believe the Pro Comp X Terrian and Super Swamper IROK are available in 33x13.50-18. These would both be a little too wide for the OEM 7.5 inch wide wheels, plus they are mud terrian tires. Nitto makes the Terra Grappler in 325/60-18 (34x13.50) and 285/60-18 (32x11.50). These would be the most comparable to the BFG AT KO's