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They usually have a magnetic sensor on the spokes and the computer counts the number of passes to calculate speed and distance.
Check the packaging to see if it's differnt, it would be a neat thing to have but hard to read as the car passes by
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"I'll leave you with my friends for a while, they are all nice guys.. Well Darin is an A-hole, Scott is a loudmouth and Jon(me) well he's just crazy."
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