When I was riding my bike, I needed a bit more power, so I switched to second gear, then stood up. to pedal up the hill.
As soon as I did this, after a few seconds, the bike pedals just slips or jumped it went klunk, and rotated forward without me pedaling it, causing my foot to slip of the pedal, and fall.
Do you know what the problem is and how I can fix it?
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