Originally Posted by Gummee!
It was a new build, so first step is to make sure everything's tight. The pedals are a big culprit. Loose crankarms may be too. The BB takes a special tool that you may/may not wanna buy now.
After that, if it still don't stop, it may and stess MAY be the frame.
Pedals are generally a 6mm allen. Crankarms are 8mm. BB is the second tool that Shimano made.
Should I just check tightness, or dis-assemble lube and re-assemble?