My apologies if this topic is common guys, I wasn't able to find any definitive answers! For a couple months now I've had this frustrating problem where my gears click and grind. I've had a tune-up at the LBS but the problem persists. It happens when I'm in 1-2 gear on back and 2-3 on front. When I switch the back to a higher gear the noise completely goes away. When I drop back down to 1-2 on front the noise comes back.

It's also hard to get to bike to switch cleanly to the third gear on front. I've twisted the derailleur knob (near the brake) counterclockwise but it really hasn't helped. I really want to fix this problem because I have a big ride this weekend. However I'm just not sure what to do.