• TheBrick(Tommy) [quote]Anthony (wolfenger) It should be fine otherwise when riding a geared bike with Biopace the dérailleur would always be moving!?

    A dérailleur is made to take up slack with the srping, this does not mean it will move left to right i.e along the casset / freewheel.[/quote]

    I was thinking more of a front to back movement. I never saw this on my old mountain bike. But then I was mainly looking forward!

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