Purchased two of these in December 09, one for the road bike and one for the mountain bike. Installed one on the mountain bike, setup the device for the appropriate wheel size, took it out for a spin - wild differences between it and the GPS I carried. Speed was sometimes three times more than the GPS unit, other times it was close, but more often wildly higher than the GPS. Going up a 15% grade it read I was traveling 9mph when the GPS read 3.9mph. At first thought it might be the front shocks possibly causing the problem, locked them out, still the same problem. Re-calibrated the unit by using the wheel length method, same problem existed. Transferred the unit to the road bike, same situation with the wild readings. Both units are going back to Amazon for a refund. Wish they worked, as I prefer not to have wires hanging and strapped to either bike. Will stick with the GPS unit solely until I find a reliable product.Get more detail about Planet Bike Protege 9.0 Wireless 9-Function Bike Computer with 4-Line Display and Temperature.
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