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The STS Transmitter Kit is perfect if you use a second bike and don't want to change the transmitters all the time. It consists of the STS speed transmitter, a bicycle holder and the power magnet. The kit is compatible with the SIGMA Topline 2016 model BC 23.16 STS.
for the second wheel or as a replacement kit
Compatible with SIGMA Topline 2016 model BC 23.16 STS