Tire Pressure Monitoring System offers a convenience of always knowing your tire pressure without the need to bend down and get you hands dirty, losing some air in the process. It also helps with safety- I actually went down once because I didn't detect that my tire leaked most of its air. Until now all aftermarket systems came with screw-on sensors. I didn't like this solution for several reasons. First, it can't accurately measure temperature of the air inside the tire. It is very important because pressure varies a lot with the temperature. Second, screw on sensors introduce another area for potential leaks. And third, these sensors have to be small, so their internal batteries don't last that long. One advantage of screw-on sensor is easy installation. Orange Electronic announced a M202 motorcycle TPMS with rim mounted sensors a while ago, however it became available only recently. Orange sells it direct for $180, but I found the system on Amazon for $146 with free shipping- a very reasonable price. http://www.amazon.com/gp/product/B0...17145&creative=399373&creativeASIN=B004WMB830 This is how the system looks like: The display module and sensors are well built. Their undersides are sealed with a resin, they are completely waterproof, but not repairable. Batteries in the sensors are not replaceable, according to the manufacturer they should last 7 years. Front and rear sensors are marked F-1 and R-2 Installation of the display unit is simple. It has to be attached to a flat surface with provided Velcro fasteners. I had an extra RAM mount laying around, it worked very well. Electrical connection has 2 wires- ground and power, which should go to an ignition switched source. I ran the wire to a fuse panel, located close to a battery on a BMW R1200GS. The wire turned out just a bit too short, so I had to extend it. My install probably represents a worst case scenario, I think that the wire length will be sufficient for most installations. Sensors were installed by a shop during a tire replacement. They told me that the installation was easy and unremarkable. Tomorrow I will have a chance to see if the sensors make tire removal more difficult- the shop managed to install one of the tires backwards. Sensors are little shorter than BMW factory valve stems Once installed, the system just works. It will show tire pressures within 30 seconds after the ignition is turned on, even if the bike doesn't move. With a push of a button the display can be changed to show temperature or to alternate between pressure and temperature. Setup menu allows changing units of measure and to setup hi/low pressure and temperature alerts. When alert is activated, the screen background changes from white to red. I don't own a calibrated pressure gauge I can fully trust, but readings from TPMS more or less agreed with the average of several cheap pencil gauges I tried. Manual says that the measurement error is within +- 1psi. So far I'm very happy with Orange TPMS. I will update this review when I learn something new about the system in day to day operation. Orange product page: http://www.orange-electronic.com/en/orange_retrofit_m202.html Update, almost 2 years and 25000 miles later I had couple of punctures and slow leaks and was always warned on time. In the winter time the system often failed to display the pressure. Orange support was good, meaning that they promptly sent me replacement parts. They couldn't assist me further and I didn't really expect any miracles in remote troubleshooting. In the end, I improved the performance by connecting the ground power lead directly to the battery. Still from time to time one of the wheels didn't register, but only when it was well below freezing. Recently the rear sensor died for good. Considerably earlier than I expected, but I can live with it, given convenience and safety advantages.