Hello all.
A few weeks ago I noticed my bike was making some noises I hadn't noticed before while pedaling. I don't think it's chain rub as I did have some of that shortly after I purchased the bike and the LBS took care of it. Rather than explain it I mounted my action cam to the lower portion of my seat tube and did a short video. Maybe some one here can tell me what might be causing this.


A bit more info about the conditions. This is a Roam 3, all stock, with 3x8 drive train. I generally stay between 3 and 6 on the rear derailleur and the middle or big gear on the front. This was middle gear and 6 but I can hear this sound on all gear combinations. It gets significantly louder while pedaling hard. In the video I am going roughly 16-17 mph and it was windy. I stopped pedaling a few times to show that the sound is only while pedaling.

I did take it back to the LBS after it got it's tuneup a month ago and the guy rode it around the lot but didn't notice anything. He seemed to think it was due to the surface I was riding on. I have since removed my kickstand so the only thing mounted is my mini pump, bottle cage and a small bag under my seat. I really think there may be something messed up inside my crank set but I'm still very new to bicycle maintenance and thought I'd see what the forum thinks before I take it back to the shop.

Thanks in advance for any assistance you all have to offer.