Quote:
Originally Posted by SentraSE-R
I'm not up on the technology, but I'm guessing the cheaper bike speedometers use a magnetic sensor on the forks or frame, and a magnet on the spokes. Ergo they'd be a PITA to install on a car.
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They've been used on motorcycles, so there's no real reason why they wouldn't work on a car.
A bigger magnet can be used if the distance between magnet and sensor gets too large.
Some don't go beyond 99 mph or kph though.