Joined: Apr 2011
Posts: 4,073
Likes: 16
From: Minnesota/Arizona and between
Bikes: Bike Friday All-Day (ebike), Terry Classic, Serotta FIerte, Trek Cali carbon hardtail, 1969 Schwinn Collegiate, Kona Explosif hardtail, Catrike VIllager
First, I would check to see if your bike needs a tuneup if you are having problems with some of your gears.
If everything is operating properly and you are still having issues, I would see if there is a bike skills class in your area. If not, I would just experiment with gears. If your feet are flying around the pedals and you feel like you aren't going anywhere, then shift to a harder gear. If your legs are tiring out, then shift down to an easier gear.