This isn't a noise, it's more like a notch, a slight bump in the otherwise smooth revolution of the front drive train, just a little something when I'm at the top of my pedal stroke (drive side). I don't feel it on the left side at all. I've made sure my chainring bolts and cranks are tight, and switched pedals to make sure the problem isn't there. If I'm spinning, I don't feel it. If I am pushing, I do. I don't notice it when I'm out of the saddle.