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Speedometer Wrong

Posted: Thu Jun 07, 2012 3:32 pm
by Expressman
Ever since I got the bike drivers have been treating me like I'm slow. So today I taped my handheld GPS to my bike to see what my true speed is. It's way off:

Bike/GPS
35/30
56/50
85/75

If I understand it right, it gets my speed from the front tire. What exactly might be the problem here?