Got the Sigma BC1009 today and spent 15-20 minutes installing it. Ended up coding the wheel size (26x1.9) rather than the alternative methods but I might compare down the road and see how accurate it is. Took a quick ride to a known distance marker and it seemed pretty spot on.

Very cool to have one of these for keeping track of mileage, time, speed, and distance. Not a bad deal for $19!

http://www.amazon.com/Sigma-BC-1009-...1465734&sr=8-1