^^this man is crazy in some ways, but straight genius in others! The smaller the tire, the quicker the pickup. The bigger the tire, the higher the top speed capability. The reason people would call him crazy is running any higher than 20's in the trail... This would rob low end power, but would help contribute to ground clearance. Its all personal prefrence. I have yet to change my tires. But I have 20's now, and I'll probably stay with that because it is quite the happy medium. If ground clearance is completely a nessecity go with 20's, or 18's with full skids. Or get 22's and screw with the gearing like the crazy/genius man above mentioned. hahaha.