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  1. Cycling
  2. Bike accessories
  3. Cycle computers
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Cycle Computer CM 4.21 HR

This new wireless cycle computer features not only with its modern and innovative look, but also with its PC configuration. This means that all accumulated data can be read-out from the device. The CM 4.21 is the perfect attender for the ambitious cyclist on ample tours. Due to the TwoInOne system it is possible to use two different wheel circumferences. The CM 4.21 therefore can be used for two bikes and be upgraded with optional cadence and heart rate functions.

Bike functions
Speed (current/average/maximum)
Speed comparisons
Trip kilometers
Programmable total kilometers
Trip/total time
TwoInOne system
Auto start/stop

Heart rate functions
Heart rate (current/average/maximum)
Programmable heart rate limit (upper & lower limit)
Calculated optimal training zone (CicloInZone ®)
Exercise time above within or below your targeted heart rate range
Calories burnt (current/total)

Additional functions
Time (12/24 h)
PowerDown mode
PC configurable

Optional functions
Cadence functions (current/average/maximum)

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