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@mashton
So, I have a bit of a problem:
Last week on my commute home I noticed that my right pedal stroke felt a bit 'loose'. I put it down to my cleat needing tightening and looked at it when I got back. It seemed that the main crank bolt, into the BB, had started to come undone. Thinking to myself "I'm sure that's not meant to happen", I cycled it over to a friend's house. On the way there, it got a LOT looser. Dangerously so, kinda hanging and wobbling, loose. Of course, I decided to tighten it up as much as possible and hope that nothing was REALLY broken.
This morning it started coming loose again. Damn.
So, it seems that something is properly broken - what should I be checking?
I am now realising that if I'd built my own bike, I'd know how all these bits hang togeter...