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  1. C

    How many gears are there on a typical bike used in the Tour de France?

    Or are they single speed?
  2. C

    Odometer for my bike?

    Is there some sort of electronic device available which I can attach to my bike that can tell me my distance travelled, average speed etc? If so, what is this device called and how does it work (maybe a sensor is attached to the wheel)?
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