• This was happening yesterday. So I tightened up both the left and right crank today (I was able to tighten both about a quater of a turn) and went out for a ride. Exactly the same thing happened!

    WHat do you think? May be it isn't the cranks? Maybe the , errr, bottom bracket? The cog? Erm, the rear wheel nuts? I'm rather lost, any guidance would be much appreciated.

    Thanks guys.

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