Well, I completed my project to convert my '05 WR450 to street-legal status in Michigan. It has both supermoto (Continental Conti-Sports) and dual-sport (Pirelli MT21s); I have mainly ridden with the supermoto tires. I'm writing this mainly for the purpose of informing anyone that's curious about how the process of converting an off-road motorcycle to street-legal status works in Michigan, as well as my thoughts regarding the suitability of the WR450 for on-road use. First, the legal issues... Conversion to street-legal status is remarkably easy in Michigan, at least for me. Go to Secretary of State to get the TR54 form (known as a "green sheet"). This tells you what you need to be street legal- pretty simple stuff. Blinkers aren't even required; I installed them, just to be safe, but it wasn't required. Headlights and brakelights were required; however, the WR was already setup for these, the headlight was dual-filament with brights, while the taillight had a brake light filament. I just had to connect the wires. Switch for the headlights, pressure switches for the brake light. You also need DOT-approved tires- this would have been a lot easier if my brother hadn't ordered the largest tires that could conceivably fit. If anyone is curious, the Continental ContiSports run wide, with a broad shoulder; I had to use a grinder to clearance the tire's shoulder so it wouldn't interfere with the chain (not far enough to get close to the airspace, the tire has a huge solid rubber triangle on the side). If someone were just setting the bike up for dual-sport, this would be easy, just use a set of DOT tires in the stock tire size. The stock brakes probably would have worked, but I upgraded to a 320 mm Braking front brake rotor and a wave rotor in the back (for the supermoto setup); stock brakes for the dual-sport tires. I also installed a TrailTech Vapor computer; I like this unit, has everything you need, and its pretty easy to setup for the different tire sizes. Its pretty easy to read too, nice large numbers. Now, the WR's suitability for on-road use... I don't think its a particularly good road bike. Prior to having it street legal, I had written some musings regarding why the DRZ would be a good street bike while the WR450 would not be. Superficially there isn't much difference in rider position, while the way more advanced suspension of the WR should (I thought) make for a smoother ride. I was able to ride a DRZ 400 SM back to back with my WR; this was quite revealing. In my opinion, the WR is not a very good street bike. Bore and stroke for the DRZ 400 is 90 mm x 62.6 mm; the WR is 95 mm x 63.4, so the bikes should have similar characteristics, right? Wrong. The WR shakes and vibrates way more than the DRZ; I don't know if the problem is from the motor mounts or some other origin; but the difference is quite substantial. Vibration creeps in everywhere; handlegrips, footpegs, seat- it is not comfortable for more than 15 miles or so. Some modifications may help; a broader seat, rubber inserts on the footpegs, isolation grips- but I don't know. Regardless, not a whole lot of wind protection; you're definitely not going to go touring on this bike. Of course, the WR, with its 5-valve head is a way better performer; mine is derestricted, which supposedly is good for about 60 hp (at the crank), as opposed to the DRZ (35 hp at the wheel, maybe about 42 hp at the crank?). Seat of the pants it feels a lot more than that; not sure if that's because the of the WR's higher redline (I think it has a higher redline; can't find that info online). Regardless, when I rode the WR I took it over 80 mph and it still felt like there was some left; my brother rode it and took it over 100 (not confirmed by GPS, but the speedometer seems to be pretty accurate). This was, of course, on our private 2 mile long drag strip (cough cough). Perfectly legal. I wouldn't recommend going that fast; no wind protection and handling gets a little skitish in my opinion, but I'm not a terribly experienced rider; someone else may find it perfectly fine. The WR also has enough power to wheelie easily (not with me riding it); I didn't get the exact numbers from my brother (speed and gear of wheelies), but he said it was surprisingly well balanced. Now, suspension has proven to be troublesome. Its way too soft for on-road use, with a lot of dive when grabbing the front brake (not helped by the 320 mm rotor). It also seems to want to lift the front tire easily; not sure if this is because of weight transfer to the soft rear suspension or something else. Cranking up the preload doesn't help, and fiddling with the rebound and compression doesn't help. This would definitely need to be remedied if I was going to keep the bike. Next, service intervals. If you were to use the manufacturer's recommended service you'd be spending a lot of time in the garage. The WR just isn't designed for street use; admittedly, since the conditions it will be used in on road are much less harsh then normal, the interval can probably be increased. But there will always be a limtitation; with a shared oil supply for transmission and engine, its not the best setup for streetability. Ok, so the whole package- not a good bike for me. This isn't to say that someone who is more experienced wouldn't enjoy it; my brother loves it, but he's a much more aggressive rider. Everything that he likes about it- easy to wheelier, easy to stoppie, really quick steering, agile and responsive- these are characteristics that make it an interesting bike for a newbie. I'm much more comfortable on a bike that has a lower center of gravity, with a less-steep steering angle. Ridiculous lean angles though- my brother had to really struggle to scrape the footpeg. It just grips and goes. Fuel economy is also disappointing; around 37 mpg, regardless of how I ride it. However, it was rich in places; my brother changed the jetting, so that may improve. In conclusion- I'm going to sell the bike. Its fun, but not what I thought it would be. I need something a little more adventure-touring oriented, probably a DL650 or something of that ilk. The fact that two of my brothers just moved to North Carolina means I need a bike that is more capable of long distance travel (800 miles each way). The WR would be a good second or third bike; if you want something that would be fun to take to the track for a weekend (any track, dirt or paved), go drive secondary roads in the mountains, or ride in the woods- it'll do it all. If your commute is 60% dirt jumps and 40% paved hairpins, it would be great. But if you can only have one bike, this probably shouldn't be it.