STS coded digital speed transmitter kit. Compatible with the following bike computers: Sigma STS: BC1009STS, BC1609STS, BC1909HR, BC2209MHR, Rox 8 and 9. Can be used as a transmitter for Bike 1 or 2.
Bike 1 or Bike 2. Simple, universal installation.
Ease of use
Automatic synchronisation with the wireless STS computer.