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Ok, you are right. I try to explain: during testing we noticed that the cranks under impact want to rotate in the same direction as pedaling, due to the greater load given by the pedal in the forward position. In this case you have to add an extra speed to the chain and the result is pedal kickback phenomena. It depends on riding style but we have seen that all our riders have experienced the same behavior. there is another phenomenon related to the motions of the bike in the xy plane that adds extra speed to the chain, I...