speed-majiggy

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hey im new here. i was just wondering about a computer i bought for my bike about a month ago. Im not to sure about the way i set it up.... does it make a difference if i have it closer to the center or if its far on the outside of the wheel. Where should it be.... because im not convinced im getting the right speeds.... do any of you understand what im saying. if you think about it if you have it closer to center it would say your going faster than you actually are....... I DONT GET IT!!!!:confused::confused::confused:

help me out please