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Not really.
The imbecile who wrote that can't spell "brake" or "disc", and Velogical's own website states that there are only two requirements:
- A rim with a braking surface.
- Over-voltage protection built into the lamp.
Just because someone puts it on an un-machined rim, it doesn't mean it will always function well in that scenario. It is fairly obvious that when the rim gets wet the small band on the dyno isn't going to be able to provide the grip to hold contact through the water without it requiring far more force to hold the dyno against the rim.
At least that person managed to do #2.
- A rim with a braking surface.
70% efficiency is incredible. Looks really nice too. I would seriously have considered that if I had a braking surface.