Sigma
- STS speed transmitter
- STS - cadence transmitter
- For Bike 1 and Bike 2
- 3 canals digit coded
- transmission system
- Less power cinsumption
- Quiker actualisation of the data
- For BC 12.12 STS, BC 16 12 STS
BC 1909 HR, BC 2209 MHR ROX