I thought about gluing the magnet from a bike speedometer onto a wheel and and the sensor close enough to pick up the signal off the magnet, with those you program in the circumference of the tire. I never got around to it though. I just ride with traffic. It's on the mental list of things I ought to do. I did put a piece of yellow tape on the speedometer at 35 mph... that's about as fast as I usually need to go around here.
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