- 1). Locate the front set of gears, the ones nearest the pedals. These are the chainrings and your bike will have one to three of them in increasing sizes. The biggest one will be the hardest gear and the smallest one will be the easiest gear. When you shift with the left-hand shifter, the front derailleur moves the chain over the chainrings. Most rides you might never shift the front gears unless there is a large difference in elevation.
- 2). Locate the rear gears, the ones attached to your back wheel. These are called a cassette and the individual gears are called cogs. These work the opposite of the front gears, where the smallest one is the hardest gear and the biggest one is the easiest. When you shift with the right-hand shifter the rear derailleur moves the chain over the cogs. You will shift on the cassette numerous times during a ride.
- 3). Determine what type of Shimano shifters you have. Some older mountain bikes and hybrid bikes have grip shifters that are integrated into the handlebar and are twisted to change gears. More modern mountain bikes and hybrids will have indexed thumb shifters mounted on the handlebar that you click with your finger and thumb to change gears. Newer road bikes will have the shifters integrated in with the brake levers.
- 4). Shift the rear derailleur by manipulating the right-hand shifter while pedaling. On a twist-shift system grip the handlebar and turn either clockwise to go to a harder gear or counterclockwise to go to an easier gear. On a thumb shifter you will click one lever with your finger to move the gears down and your thumb to move the gears up. With a brake lever system on a road bike, use your fingers to press the lever inward (toward the stem of the handlebar) to go into an easier gear and press either the small lever located on the side of the brake hood or the lever behind the brake lever to move into a harder gear.
- 5). Shift the front derailleur by using the left-hand shifters while pedaling. They work opposite to the right-hand shifters. On a twist-shift system grip the handlebar and turn either clockwise to go to an easier gear or counterclockwise to go to a harder gear. On a thumb shifter you will click one lever with your finger to move the gears up and click the other with your thumb to move the gears down. With a brake-lever system on a road bike, use your fingers to press the lever inward (toward the stem of the handlebar) to go into a harder gear and press either the small lever located on the side of the brake hood or the lever behind the brake lever to move into an easier gear.
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