Place your hand over the brakes when riding the bike as if you plan to stop the bicycle. The left set of levers still controls the front gears.
The right set of levers still controls the rear gears.
On newer model Schwinn road-racing bicycles, the levers used to change gears are part of the levers used to apply braking power to your bicycle. Pull back on the top lever to shift the bicycle to a lower gear. Push the bottom lever to shift the bicycle up to a higher gear. Locate the shifter levers on either side of your handlebars, remembering that the left-side shifter controls the front gears (usually two or three speeds) and the right-side shifter controls the rear gears (usually between five and 10 speeds). These systems operate with two levers per shifter. On many Schwinn fitness-oriented road bikes and on most mountain bikes, you will find trigger-style shifters. If there is a shifter on the left side, manipulating it will change the gears located on the crank of your bicycle (the crank is the part to which your pedals are attached). If this is the case, there will be no shifter on the left side. Note: Some bicycles will have gears on the rear wheel only. Repeat this process with the shifter located at the end of the left grip.