Cateye Wheel Magnet Universal 169-9691

Fits both round and flat spokes, so I didn't have to worry about compatibility with my aero wheels. Snapped right on and hasn't budged since I installed it.

Spent way too long fiddling with a zip tie to get my old magnet aligned, so this universal one is a relief. It fits my flat spokes without any wobble, and the 4mm width limit covers everything I've got. Solid little fix for a few bucks.

I was a bit nervous about getting the right fit, but the fact that it handles flat spokes up to 4mm wide made all the difference for my aero wheels. Snapped right on and my speed sensor reads perfectly again.