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Sportbikes & Sport-tourers Got a supersport, sport-tourer or streetbike? If you prefer the twisties to the open road, this is the place to talk about it!

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Old 06-18-2006, 08:03 PM   #1 (permalink)
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Join Date: Jun 2006
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Default All motorcycles speedometers 15% fast?

Last year when I had my first motorcycle (Aprilia RS 50) I suspected that maybe the speedometer was reading high and someone who owns 3 motorcycles told me that all motorcycle speedometers are 15% fast. He seemed like he knew what he was talking about.

I clocked the bike against my car and it turned out that it was _exactly_ 15% over

I now own a GSX-R 600 and I swear the speedometer is also fast.

I have not tested it yet, but I am going to go out on a limb and say that when I do I am going to find out that it too is also 15% over.

Can anyone here confirm my suspicion?