old_rider wrote on 05/27/14 at 21:36:42:I use the Dell 100 bicycle speedo.... you can set wheel size (I leave it at the 2124)... you can set it for Km or Miles per hour. It has a clock, two trip meters, odo and a couple other things I don't use

Cheap too, like $12 and easy to install... guess i'll make a video or take a couple of pics, I used a bigger magnet than came with it and glued it to the rim, put the pickup on the right side fork... it works very well.
http://www.walmart.com/ip/Bell-Sports-12-Function-Speedometer/15188326 +1, Old Rider (I am, too!) I did the same thing with the same $12 Bell bicycle computer (from Walmart) over a year ago, has been a a true blessing ever since. One thing, tho - right after I installed it, a big bug nailed it. No damage, but it came loose in the mount and zeroed the settings. Now it hides behind a tool bag. No more worries, but since it doesn't have a backlight, it's not much help at night.