This wireless STS cadence kit is compatible with BC 1609 STS, BC 16.12 STS/CAD, 1909 HR, BC 1909 HR STS, BC 2209 Targa STS; STS, BC 2209 MHR STS and Rox 8.1/9.1. The power magnet can be adapted to the particular distance between the crank and the frame using a spacer. This allows a distance between the magnet and transmitter of up to 20mm. Tool-free mounting. Suitable for bike 1 and bike 2.