Sigma BC 1909 STS Triple Wireless Bicycle Speedometer

The BC 1909 STS's HR functions include ECG-precise measurements of your actual, average, and maximum heart rate, along with a zone alarm that tells you when you're exceeding or falling below your target heart rate. In the process, the computer keeps track of your calories burned thus far. The BC 1909 STS also includes a number of time-specific functions, including a countdown timer that's perfect for racing against the clock; a stopwatch that keeps you sharp on intervals; a display for elapsed and total riding time (the latter is only available after your ride); and a time-keeping clock. And serious cyclists can opt to use the cadence functions (current and average), which help you ride efficiently both on the road and in the woods. You can also turn off the cadence functions while riding.

The BC 1909 STS is versatile in other ways, too, with the ability to automatically recognize a second bike. That means you can gauge the total distance and ride time of either or both bikes, a handy option for couples or friends who train together. Other features include a temperature display, seven language settings, a backlight, a battery status display, and a backup function that preserves your settings and info even when the battery dies. The PC-compatible BC 1909 STS is also available in a wired version.