After seeing them around more and more frequently, I decided to try running a trials tire on my 07 wr450. Before this I had been running a Maxxis IT, and I really have no complaints about that tire. I purchased the pricey michelin trials tire, and took my bike out to Forresthill a week or so ago, and what I noticed was traction. The conditions were obviously very dry(California in late July), and the tire did very well. Firstly let me say that I did like the tire, and I will be running it more, and testing it more as the summer progresses. The tire greatly reduces wheel spin under acceleration and provides more traction and feel in every area. It was awesome in the rocks and technical sections, as I expected it to be. Forresthill has some very rocky and difficult climbs on trails 5 and 6 and I was happy to have this tire on those sections. It was nice for braking going down hill, as the tire did not break loose and begin to slide as easily. On some of the faster flowier trails, the tire felt a bit different. The most notable and expected difference has to do with sliding the rear tire into turns, and accelerating/oversteering out of turns. The tire just felt a little strange in these situations. It hooked up more than I was used to, so my bearings were thrown a bit. At first, I couldn't even get the thing to slide. As i got more comfortable with it I was cornering better, and I could get it to break loose, but it just took a lot more. I started kind of turning my bike with my knees out more like a trials rider than a motocrosser. Ripping open the throttle and kind of steering with the back of the bike when you're coming out of a turn is one of the fun parts about having a 450, and the trials tire and it's softness do hamper that. In all fairness, that's just not what it's for. The trials tire puts all of your steering duties back up front because the rear end isn't as squirrelly. It did a pretty good job of putting all the power down, but I did feel a slight zap. It could just be mental though, like 250f syndrome. The tire was nice, and I think that I will keep one around on a spare wheel. I'm actually more curious to see what it acts like on my yz250 2 stroke. I don't think that it was quite the god sent gift that some have made them out to be, but it was really nice in a few spots, but not without it's drawbacks. With the wear that I noticed from the first day, I think that I will be able to get about 8 or so good rides out of it, so about on par with a normal tire. I guess that when selecting whether or not to run this tire instead of a knobby, I would just try to figure out how much time I planned to spend in 4th and 5th gear. If that time was going to be a pretty significant part of my day, I would skip the trials and run the regular set up. But for nasty single track exploring, or any day that was going to be slower, tighter, and more techy, I would throw the trials tire back on in a second.