Rated 4 out of 5 by k4r1 A bit pricey but it stays put.
I've had one of these mounted on my MTB for about 3 years now, and it hasn't come off. The adhesive backed pad plus the extra security of the tape means this isn't coming off in a hurry. Though it is pricey for what is basically a small magnet.
Also this comes bundled with the cadence sensor, so if setting up a 2nd bike only the sensor is required.
04 September 2013