Sigma STS wireless cadence transmitter. It serves as a spare part, for use on the second wheel and also for retrofitting the BC 14.16 STS and BC 16.16 STS models for cadence measurement.
For models: BC 14.16 STS, BC 14.16 STS / CAD, BC 16.16 STS, BC 16.16 STS / CAD, BC 23.16 STS / CAD.








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