To mount the sensor are at both cable ties and a rubber ring. To use both at once is relatively difficult and so I enschlossen me for the cable tie, because I wanted to use the sensor on my mountain bike and i terrain.
With the cable ties was not a problem and fix the sensor has not been solved even during my previous use, also Waehrens ruppigerer slopes in no terrain.
If one considers the distances and markings on the sensor (the small "arm" the sensor measures the wheel revolutions using a magnet to the spokes and the sensor itself measures the cadence with a magnet that is firmly fixed with a rubber on the pedal crank) works all in conjunction with an iPhone 4S and Runtastic (both "Bike" and "mountain") outstanding.
Small supplement, in compiling a Polar chest strap with Bluetooth for heart rate measurement was additionally used, without which there would have been problems.
