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He was wondering if it could be caused by not tightening enough, but like @Scilly.Suffolk I thought pedalling tightened rather than loosening... £60 mistake... Not that bad really... I'll help fit it... I'm due that will stop any further mistakes ;-/
Anyone think the pedals need replacing too?
In fact do you think now it's been tightened properly it might survive? (Did another 20 miles without issue)
Friend has new bike (cube 2014 29er), he fitted the pedals by hand... Doing laps of richmond park, pedal comes out of crank. I have a 15mm spanner so manage to undo pedal, taking some shards of metal from the threads and then put the pedals back on again.
He mashes, but it had about 20 miles so seems odd that it should happen?
I don't think it's possible to miss thread a pedal by hand, is it warranty issue, any idea how it happened?