a quick question. the back wheel has only “crossed” spokes on the side with the gears. the opposite side, which is where you would need to put the “speed magnet” is straight spoked.
where do you attach the “speed magnet” - hope this is clear…
If you have one of the types of magnets that clamps onto two spokes near the crossover, go to the bike shop and buy one that clamps onto one spoke. All shops carry them. Couple bucks and you’re all set.