I know I'm not THAT strong... right?
I got a new steelie a while back (Jamis Aurora) and it's coming up on time to adjust my derailers etc (which is a little intimidating, as I've only done it with downtube friction shifters before, and this is a STI brifter system) but with them just a hair out of alignment, I noticed on downstrokes I hear a grinding, and looking down, it appears that the chain is rubbing the front derailer when I do....
Am I flexing the frame to cause this?
I'm a rather weak commuter (< 15 miles roundtrip a day) and this isn't a 15 lb light is more important than anything flexy flier, although it IS a price-point bike)
Or is it something else?