Just bought a pristine '97 DR350SE over the weekend. It has offroad knobbies on right now that are a little spooky on the road if you get to 50mph or so. I will be riding the majority of the time on pavement..maybe a 90/10. Anyway I already read threads on suggested tires and am looking at IRC's or Kenda's. The front is a 80/100-21 and the rear a 110/100-18 on stock rims(no idea what size rims are). When I go to look for tires most of what I see are these 5.1 blah yada bing sized tires. Will any of these inch-measured tires fit my rims? I need something stable for streets. I am new to motorcycles again so the tire deal is somewhat confusing right now. Thanks!