How to Adjust the Derailleur on a Schwinn Bike

Bicycles with gears use derailleurs to guide the chain off the sprocket or chain ring onto the next gear. When the derailleur's shifting accuracy decreases, it is time to adjust the tension on the cable between the derailleur and shifter. This is done using the derailleur-adjuster dials at the shifter pods. If the rear derailleur is misfiring, check that the frame or derailleur drop-out hanger isn't bent before adjusting the device. If the frame is not bent, adjust the derailleur with the dials. If the frame is bent, take it to a certified bicycle mechanic for professional repair.

Instructions

    • 1

      Sit on the bike and begin pedaling. Turn the right-hand derailleur adjuster dial found at the end of the shifter where the cable enters the shifter pod. Turn the dial 1/4-turn clockwise to tighten the shifting. Shift the gears on the rear derailleur and see if they shift properly--look for clean and smooth shifts between the sprockets.

    • 2

      Continue to make 1/4 turn adjustments at the dial until the shifting is smooth and at your desired settings.

    • 3

      Turn the left-hand side dial 1/4 turns clockwise and shift the left-hand front derailleur shifter. This adjusts the chainrings. Feel for smooth changes between the chainrings and make 1/4-turn increments until the front derailleur changes the chain smoothly between the three chainrings.

    • 4

      Stop pedaling and go to the back of the bicycle. Turn the dial adjuster at the rear derailleur where the cable enters the device. Use 1/4 turn increments to fine tune the rear derailleur shifts. Pedal and shift to check the adjustments.