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@tomasito
And the point of this is....
"This construction has the only purpose of improving your pedaling. It works like this, if you don't keep an even pressure on both pedals throughout the hole stroke the mechanism sort of skips a bit and the pedal loses traction for a very brief moment. This forces you to keep your mind i a total focus with pedaling at all times and it is exhausting i can tell, also because the even pedaling also goes for breaking (52/16). I am not shure exactly how it is made but I know that the bottom bracket is split in two and that the rear hub is built up from scratch. If someone is interested in this you should contact Dieter Herbert who is the inventor behind this awesome creation systemherbert@comhem.se He calls this "Pedal stroke power indicator with click control" and this training philosophy and equipment might in the future be an absolute necessity for every competitive cyclist."