Transmission: The engine's power is transmitted to the wheels through a transmission. Four wheelers typically have a manual transmission with multiple gears, allowing the rider to select the appropriate gear for the terrain and speed. Some four wheelers also have an automatic transmission, which automatically shifts gears based on the vehicle's speed and engine RPM.
Drive System: Four wheelers are typically equipped with a four-wheel drive system, which allows power to be sent to all four wheels. This provides increased traction and control in slippery or rough terrain. Some four wheelers also have a two-wheel drive option, which can improve fuel economy and reduce wear on the drivetrain when riding on smooth, paved surfaces.
Suspension: Four wheelers have suspension systems that help absorb bumps and vibrations from the trail. The front suspension typically consists of independent A-arms with shock absorbers, while the rear suspension may use a solid axle with leaf springs or trailing arms with shock absorbers.
Brakes: Four wheelers have brakes on all four wheels. The front brakes are typically disc brakes, while the rear brakes may be either disc or drum brakes. Some four wheelers also have a parking brake, which helps prevent the vehicle from rolling when parked.
Wheels and Tires: Four wheelers typically have large, knobby tires that provide traction in a variety of terrain. The wheels are usually made of aluminum or steel, and they may be either spoked or cast.
Controls: Four wheelers are controlled by handlebars, which allow the rider to steer the vehicle. The handlebars also contain controls for the throttle, brakes, and clutch. Some four wheelers also have a foot-operated brake pedal and a gearshift lever.
Lighting: Four wheelers typically have headlights, taillights, and brake lights. Some models may also have additional lighting, such as turn signals and hazard lights.
Additional Features: Four wheelers may also have a variety of additional features, such as a speedometer, tachometer, odometer, fuel gauge, and a cargo rack. Some models may also have a winch, which can be used to pull the vehicle out of mud or snow.