Sigma BC 509 Bicycle Speedometer Basic wired bicycle speedometer for casual or training ridesDisplays current speed, trip distance, and total distanceAutomatic start/stop; scan mode with on/off optionPC link compatible with bicycle training softwareLarge easy-to-read display; water-resistant housing The most affordable SIGMA computer is extremely easy to handle and features a crystal clear display. The automatic function scan (auto scroll), with self-explanatory icons, can now be switched on or off. The menu settings are accessible without tools. Handlbar or stem mount. Downloadable with optional docking station.Learn just how fast you're cycling on commutes or training rides with the entry-level Sigma BC 509 wired bicycle speedometer. The speedometer displays such info as your current speed, trip distance, and total distance, so you'll have