Where the sensor is on the spoke shouldn't make any difference as all really does is count each time your wheel makes a full revolution. What probably happened is that your new wheels and or tires are a bit different circumference than your old ones, so you need to reset that number in your computer. You may need to pysically measure. If you want to be very accurate have someone help you so that you can be on the bike. Using chalk or pencil and a concrete surface mark out one full revolution of your front wheel with your weight on the bike. The measured result in millimeters will be the circumference number that needs to be entered into your computer and should clear up your accuracy problems.



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