Ok guys, I've successfully dual sported my '04 WR450. It is still riding on the stock tires which are not made for pavement at all. I've been looking at some tires and don't know which tire, nor what size is best for me. The Michelin Sirac looks pretty good as does the Avon Gripster AM24. To me they look better for street riding than the Dunlop Trailmax. Also I've noticed that these tires don't come in the exact sizes as what my bike came with. They are all lower profile which stands to reason for a more street oriented tire. My stock rear tire is a 110/100/18, I don't want to run anything thats' circumference is less than that.The bike is already turning several RPMs cruising at 60 mph. What size would I need in an 80 series profile to equal that circumference, a 130??? Will a 130/80 fit on my WR? I'm not real concerned about the front sizes as they don't effect gearing. It appears that a 90/90, or 80/90 is about all you can get anyway. What's my best route as far as tires and sizes?