Originally Posted by dwainedibbly
Very interesting idea. Anybody know how much those magnets weigh? Are we adding a lot of rotating mass to the wheels? Is there an on/off switch so that you can turn them off when you don't need them?
The magnets are pretty light - I think the magnetic part is only a couple of CCs, and the rest is plastic. I certainly notice no difference in terms of angular inertia, even when spinning the wheels by hand. It also helps that the magnets are positioned quite close to the hub.
There's no on/off switch. If you want the light to stop, you have to remove either the magnets or the light itself. The former requires a screwdriver and is pretty annoying to do. Removing the light is easier - just unscrew your skewer endcap, remove the light, and screw it back on.