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Stuart Hibberd2020-06-17 17:33:07

Just to say that you only need a single pulley to tension the chain. It does need to tension the chain. Allowing the derailleur to take up the slack does not work so well. When the front rider stops pedalling, the rear rider does not stop immediately this transfers any slack in the bottom of the chain up to the top and this can result in the chain coming off. I have done this. See photo showing position of pulley.