I finally got one that works. I tried the Ascent Delta V. It was $25.00. No matter what it didnt work. It was easy enough to program, and I was imputting the wheel size correctly. I even took it to the bike shop and had them program it. So they said it was defective and gave me another. Same thing, it just didnt work correctly. Most of the consumer reviews were very bad. The directions showed it going on the right fork, but consumer reviews said it goes on the left fork. I was getting frustrated! So I upgraded and got a Cat Eye Vectra for $34.00. Its very accurate. My max speed is 26mph and my average cruisingalong speed is 17mph.