This is what it looks like with a super magnet taped to the rim.
Bike freaks will certainly be interested in the weight savings of nearly 10g.
The magnet weighs only 0,3 g compared to a weight of 10 g for the original magnet.
You might laugh now, but if I enter this savings into the formula at www.2peak.com
it calculates a time advantage of 2 seconds on a stretch of 90 km with a 1000 m climb!
If you include the better aerodynamics, which are unfortunately not so easy to measure, you will certainly have won 10 or more seconds, which during an Ironman, for instance, you definitely don't need.
OK, let's just leave the time advantage: I simply like this solution better and think it's therefore worth the effort!