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Old 02-27-2009, 10:28 AM   #1
bioGuru
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speedometer?

How inaccurate are speedometers from the factory?

Is there an easy way to get them calibrated? or at least find out how much they are off?
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Old 02-27-2009, 10:30 AM   #2
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my bike was about 5% off from factory.

speedohealer. $99 well spent.
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Old 02-27-2009, 10:33 AM   #3
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what he said
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Old 02-27-2009, 10:35 AM   #4
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Mine shows 4 mph faster than it really is. I put a gps on and determined that.
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Old 02-27-2009, 10:37 AM   #5
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it varies...the faster you are travelling, the more room for error. The slower you go, the more accurate it will be...like others said, speedohealer.
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Old 02-27-2009, 10:49 AM   #6
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I know Suzukis are 8% off from the factory....and get a little further off the faster you go....8-10% is a good guess...

Speedohealer kicks .
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Old 02-27-2009, 05:09 PM   #7
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thanks guys.

It was "feeling" about 10% off (reading 10% higher than I was really going). Which seemed like a lot to me.

Why are they so far off from the factory?

It seems to be a simple thing to measure the rotation of the wheel and they know the distance the wheel should travel in a single rotation, etc. -

rotations/time * distance/rotation = distance/ time (commonly referred to as speed)

It appears that to use speedohealer you must first determine the error - right?

What is the best way to determine one's speed in an accurate and precise manner?
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