Hi there I have recently changed my front sprocket to a 14tooth but at the same time I changed my rear tyre to a 140/80 so per all the gear ratio calculators it should be the equivalent to adding two teeth to the rear sprocket instead of three. All is well I love the feel of the bike. But one thing that has baffled me, I have put my gps on to check the speedo and it is reading perfectly spot on to .5 of a km/hr I would have thought the speedo would be reading higher than what I am doing with the sprocket change. Im very confused

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