Alright, here's the deal. When I drive to work I go 75mph (both on my bike and in the car). When I drive the car I don't really get passed by other motorists (speed limit is 65 and 70 in some spots), but when I'm on my bike I get past by almost all the cars (even some semis). I suspected that my speedometer is misreading, so I performed a little test. I had my brother-in-law drive next to me in his car. The results are as follows:
While side by side, we signaled to increase to 40 mph. At 40 we stayed even with each other. After getting on the freeway he signaled to go 75. While we started out side-by-side he started to pull away and gradually built up his "lead." I had to go about 80-85 just to catch up.
Has anyone noticed their speedometer giving mis-reads? Is this a calibration issue? Can anyone explain this phenomenon to me? I read somewhere that the factory speedometer can be off by as much as 10%. Thanks for the help.
While side by side, we signaled to increase to 40 mph. At 40 we stayed even with each other. After getting on the freeway he signaled to go 75. While we started out side-by-side he started to pull away and gradually built up his "lead." I had to go about 80-85 just to catch up.
Has anyone noticed their speedometer giving mis-reads? Is this a calibration issue? Can anyone explain this phenomenon to me? I read somewhere that the factory speedometer can be off by as much as 10%. Thanks for the help.
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