The Astrale8 is a wired computer that comes standard with a rear wheel mounted speed sensor and a cadence sensor. I've had mine for a week and it works excellent. I ride on a couple marked paths and its accuracy right on the money. The going price at the LBS, Dicks Galyans,etc near me is $39.95. Can be had cheaper mailorder through Performance, etc when on sale. Check out Cat eyes website.
http://www.cateye.com/en/products/vi...d=6&subCatId=0
str8shooter