The chassis is what truly sets the overall style of the two-wheeler. Chassis is the main carriage systems of a vehicle. The type determines the gearing configuration, flex and the type of modifications that can be accommodated.
- Frame: The frame serves as a skeleton upon which parts like gearbox and engine are mounted. It can be made of steel, aluminum or an alloy. It keeps the wheels in line to maintain the handling of the two-wheeler.
- Suspension: It is a collection of springs and shock absorbers. It can be of two types: front suspension and rear suspension. It insulates both the rider and the bulk of the machine from road shocks and also keeps the wheels in the closest possible contact with the ground and gives control of the vehicle to the rider. The front suspension helps to guide the front wheel, to steer, to spring, to dampen, and to provide support under braking.
- Wheels: A wheel is a circular object which with an axle, allows low friction in motion by rolling. A wheel is made up of the rim and spokes or disc plate. Wheels should be aligned properly because it directly influences driving. Two-wheeler wheels are generally of aluminum or steel rims with spokes.
- Brakes: Generally, there are two independent brakes on a two-wheeler: one set on the front wheel and one on the rear, however, there are many models which have 'linked brakes' and apply both at the same time. The front brake is generally much more powerful than the rear brake. Brakes can either be drum or disc based. When the rider operates one of the brakes, a fluid element known as hydraulics is pressurized to provide the required forces to squeeze the brake pad material onto the rotor and slow down or stop the vehicle.
