Eddy Current Brake for Aluminum bike rollers

WARNING: Please exercise extreme caution with Neodymium permanent magnets. A 1" cube magnet has a pull-force of ~30-40lbs, if you have 2 of them stuck together, they could do some serious damage to your fingers, not to mention they would be extremely hard to separate. They are also very brittle, so they could crack and chip when they snap together.

If you own a set of aluminum bike rollers and feel they do not have enough resistance for a good workout, this will add significant resistance. I