How does changing a sprocket affect the speedo? Where is it taken off from on the NSR's? RGV speedo is connected to the front wheel you see so it doesn't matter what gearing you run, it's always 10% over

As for bicycle speedo's (not the swimming trunks) I have seen a normal cateye used on a 916 that I rode. It seemed really good but I wondered about accuracy due to tyre deformation at speed. The unit is set up by meauring the rolling circumference of the tyre but how much does this change at say 100mph?

GPS should be the better way to go if the unit updates fast enough, ie the Tom Tom in my car reacts relitivley slowly to hard acceleration jumping numbers as it updates. But then speed is not it's primary use so it doesn't matter much.
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