I got a Schwinn cyclometer at Walmart for $8.88. Doesn't do the cadence or multiple bicycle circumferences but does allow you to edit the odometer when changing batteries (or making it match your yearly figures or whatever). Has all the basic features like avg mph, time, trip distance, etc. and is just as accurate as any other cyclometer on the market when calibrated correctly. (as you must do with any cyclometer). Buy two for both your bikes. I use that along with my GPS.