Inaccurate Speedometer. Bad Speedo-Tuner. Is their any fix?

nhdiesel said:
Actually that isn't true. Changing the diameter of the rear tire will still make the speedometer read inaccurately even if its read off the final drive.
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What he said is true. Tire size will have no effect on the speedometer reading. For a given RPM in a given gear will show a specific speed on the speedometer, regardless of tire size. Now, your actual speed will change, however so slightly on tire wear. The error is in the pulses per unit of measure. If you change that unit of measure per pulse you will make your speedometer more accurate to your actual speed.

Kevin
 
Kevin_56 said:
Now, your actual speed will change, however so slightly on tire wear.
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We are coming at it in two different directions, but in the end, changing the diameter of the rear tire does make the speedometer, in relation to the actual speed of the bike, read differently. Only using a non-mechanical device, such as a GPS, ignores tire size.
 
Metalman said:
My speedometer reads faster than my GPS and the odometer reads more miles than the GPS although it's only off 2% or so rather than the speedos 8.
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I saw the same thing. The speedometer being off by 12%, but the odometer was surprising close. Like you say, only about 2% off. I don't mean to be a stickler, but I would like to see them both accurate to within 1%. After all these are modern bikes, those computers are pretty smart.
In fact if you could input tire change events the little computers could estimate the wear and compensate for it. If it also knew the tire pressure, accuracy could be improved again.
 
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