Not to sure what it's coming from I don't have the tools to take the crank off or adjust the bb. The funny thing I don't get is that the creak is gone the next time I ride my bike then when I may go over a root or something and hour and a half into my ride the creak comes back then get progressivly worse the more I pedal. Then the harder I pedal the sounds gone. The lighter I pedal the sounds there. Th e only side it comes from is the left. I dont get it at all. I'm. It really bike inclined which is odd since I work as a vehicle mechanic. Any one have any suggestions.oh and the bb is a shinamo un-26 sealed square tapered bearing. And the bike is 2 months old
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The crank arm is most likely loose on the square shaft BB. Remove it, clean it, grease it and retorque it in place.
There are many possible causes. But it's likely the cranks are slightly loose on their axle. Vigorous pedalling and warming up during the ride make the situation worse.
I have posted a detailed answer here. Please scroll down to see the answers from me and Deemar.