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@gretsch
when I spin fast, I can feel my the bike bounce a little. my first thought (and probably 90% of the problem ) is uneven pedal stroke... however, whilst servicing my bike, I spun the pedals and noticed that past a certain speed, the cranks do it on their own... then under a certain speed it calms down.
It's not a big problem, I'm just interested if there is a reason for this?