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@avsmithy
Movement of the crank out of stock specifications. All cranks have L to R movement, to some extent, but an excessive lateral crank movement has bad reprocussions, such as hitting/grinding/destroying the crank sensor. A "walking" crank necessitates an engine rebuild.
it aint funny but at least you can tell some asshole who falls of his bike that "you got crank walk mate" and then just cycle away...