- Frame: The frame of a four wheeler is usually made of steel, aluminum, or carbon fiber.
- Suspension: The suspension components, including the control arms, springs, and shock absorbers, are typically made of steel, aluminum, or a composite material.
- Engine: The engine block and cylinder head are typically made of aluminum, while the pistons, connecting rods, and crankshaft are made of steel.
- Transmission: The transmission case is usually made of aluminum, while the gears and shafts are made of steel.
- Drivetrain: The driveshaft, universal joints, and differential are typically made of steel.
- Brakes: The brake rotors and calipers are usually made of steel, while the brake pads are made of a composite material.
- Wheels: The wheels are typically made of aluminum or a composite material.
- Tires: The tires are made of rubber and contain nylon or steel cords for strength.
- Bodywork: The bodywork, including the fenders, hood, and doors, is typically made of plastic, fiberglass, or aluminum.
