We have successfully used two Cateye V2C computers with one sensor on the chainstay. It picks up cadence and speed for both computers, and we have not had any problems with it. It has worked flawlessly on our Calfee for 1200 miles, and we successfully tried it out on our steel Co-Motion Speedster before moving it to the Calfee. The only issue we have had is the short "go to sleep" time of about 5 minutes - it makes it easy to start with the computers off after a short break. I painted "wake up" in red letters on the stokers rear view mirror, and this helps remind us sometimes. It also generates some amusing comments at rest stops.