This is what I responded on another forum via PM. Maybe it will help someone here little later :-).
The magnet may be an issue on some wheels - you can check if Trek makes special magnets for their wheels. I have Mavic wheels so the magnet fits perfectly on the spokes I have (Mavic designed the road
bike pod). I had similar issues with Polar speed sensor on Mavic wheels and had to order magnet for like 3 bucks.
As for pairing - read the pairing instructions. Most of the
Suunto pods can be paired following way:
1. Open the battery hatch
2. Take out the battery
3. Turn it around and insert it upside down which resets the sensor and sets it to pairing mode
4. Put the watch to pairing mode
5. Insert the battery back to the
pod the right way
6. Should pair in like 5 seconds
This works for all sensors but new
foot pod. The new
foot pod needs to be turned upside down to put it into pairing mode. Should work fine. I did this quite a few times and never had any issues.