Bare with me if you surf other sites, I am posting this everywhere because I think it is very useful info. My bike is a supermoto, and I don't know what the drawbacks of going tubeless with an off-road bike are, but if you hate tubes, here's a real cheap way to go tubeless. I finally got around to making my rear rim tubeless. I will do the front one next, but I am waiting until the next time I need to change the front tire. Here's what you need: A tubeless type valve stem, a large cylinder of clear silicone (get at any hardware store), a calk gun to apply the silicone with, and duct tape. AND A RIM THAT IS DESINGED TO ACCEPT A TUBELESS TIRE BEAD!!!! PLEASE READ THIS WHOLE THREAD, THERE IS GREAT INFORMATION HERE, AND MANY DON'T BELIEVE THAT THIS IS SAFE. TAKE THIS INFORMATION AS AN FYI, I HAVE DONE IT, IT MIGHT NOT WORK AS WELL FOR OTHERS! Clean the inside of the rim off very well, and let it dry. Then apply a big blob of the silicone over each spoke nipple. Let the silicone sit for a few minutes and form a "skin", but not totally dry. Then, take the duct tape (this part is much easier with two people - one to hold and secure the tape, the other to turn the rim) and tightly wrap it around the siliconed spokes. Do about 3 or 4 full wraps with the duct tape, and let it sit and cure overnight. Oh, you'll obviously have to cut a whole in the duct tape at the base of the new valve stem. Also, but some silicone around the base of the valve stem. I suggest filling the tire with air right after applying the duct tape, I think the extra pressure helps push the silicone into all the right places. It sounds cheap and I was skeptical at first myself, but I figured what do you have to lose? My first test was filling the tire with 60 psi of pressure and letting it sit. No leaks. My next was a quick run around the neighborhood. No leaks. I've done 450 miles on the bike since Friday, and it hasn't lost a tenth of a PSI of pressure. Good luck!