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I posted my opinion on this elsewhere...another forum, but wanted to add, it's not just Chinese rides. I have 2, turn of the century model BMW's, both read 5 mph faster than actual speed, yet both odometers are accurate.
On my scooter, I went from the original 120/70-12 tire, to a pair of 110/90-12's. This taller tire corrected the odometer error, but the speedo is still 4 to 5 mph optimistic.
My Russian made Ural, is just the opposite.....speedo is right on.....odometer lags 7.5% behind actual distance traveled.
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