Its about time I need some new tires for my Raptor. I do have a couple of questions regarding what the letters mean. Such as MXR, and XCR. I know MX is motocross, and XC is cross country?. But what does the R stand for? Racing or Recreational? Basically I just ride in trails, gravel pits, and sandbars, racing between freinds in these areas, and a little of road use. I like the holeshots and kenda klaws, and razrs, but which would fit my style of riding. and what size? 18x10x9's seem a little bit two low profile for me, but the 20x10x9's which is stock looks a little bulky. Also I have about $200 spend on tires, should I change all 4 out, or just buy two sets of the rears for future use. The fronts have hardly any tire wear. Rockymountainatv has about the best prices, but ebay is seems like a great place too. Thanks for any input.

Also, I am getting use to jumping the quad. Little 10-15 jumps, should I be concerned with the frame stability, and if so can I make it stronger by gusseting it?
Thanks again.