Swing arm

Role in the rear suspension of a 125 motorcycle

The swing arm, also called the suspension arm, is a component of the 125 motorcycle that connects the rear wheel to the chassis. Triangular in shape, its essential role is to make the connection between the wheel and the suspension, as well as to absorb shocks.

It plays a central role in the operation of the rear suspension, just like the shock absorber and the wheel itself. Together, these components help give the motorcycle good handling, stability and driving comfort. They absorb road irregularities and keep the rear wheel in constant contact with the ground.

The swing arm is fixed to the frame via an axle called swing arm shaft which passes through two bearings, called swing arm bearing, inserted into the arm. It is also connected to the rear wheel par another axis which we call rear wheel axis as well as par spacers.

The different types of this component

Simple model

It exists in several types to adapt to all types of two-wheelers. The single arm model is the most common. In this case, the rear wheel is supported par a single arm, usually made of steel. It is particularly appreciated for its simplicity and its ideal robustness for type motorcycles. trail or enduro.

Dual model

The double-arm swingarm is made up of two arms in parallel and is generally intended for sports or racing motorcycles. Its solid structure allows it to better resist stress and offers excellent behavior when cornering.

Mono model

The single-arm model, also called one-piece swingarm, is a high-end model found on certain sports or road motorcycles. Design and resistant, it also provides particular driving comfort thanks to its great lateral rigidity.

Swingarm operation

It works in coordination with the rest of the suspension. When the rear wheel encounters an irregularity in the road, the arm moves up or down to absorb the shock, while keeping the wheel in contact with the ground. It is essential that it is in good condition so that the motorcycle maintains good handling and optimal driving comfort.

Choosing the right part for your 125cc motorcycle

The swing arm comes in different materials including steel and aluminum. Steel is a heavier but stronger material than aluminum. Choose the one that best suits your vehicle.

Depending on the type of motorcycle

It is important to choose it adapted to your type of motorcycle. Par example, a single swing arm will be ideal for a trail, while a double-arm swingarm will be suitable for a sports bike. Likewise, a specific swingarm for moped or quad must be chosen for these types of vehicles.

Depending on the use of the motorcycle

The choice also depends on the use you make of your motorcycle. For road use, a standard swingarm will be sufficient. For off-road or competition use, it is preferable to choose high-end ones, more resistant and offering better behavior.

Installation and adjustment of this item

Installation steps

Installation is generally a simple operation, but requires a minimum of mechanical knowledge. The first step is to remove the existing swingarm and then mount the new arm in its place. It is recommended to regularly check the tightness of the fixings to prevent the arm from moving.

How to properly adjust the swingarm

Adjusting the swingarm is a crucial step for driving comfort and safety. You must ensure that the arm is correctly aligned, that the shock absorber works correctly and that the rear wheel is correctly positioned.

Maintenance and repair of this element

Care

Good maintenance is essential to guarantee its lifespan and proper functioning. It is particularly recommended to regularly grease the axles and bearings, and to check the general condition of the arm during each service of the motorcycle. In case of abnormal play or traces wear, do not hesitate to replace the defective arm or spare parts.

Repair: when and how?

Repair is an operation that requires specific skills and tools. If you encounter problems, do not hesitate to call a specialist.

The arm ensures excellent driving comfort, good road holding and is generally reliable and durable. However, it requires regular maintenance and can wear out over time, requiring replacement.

Spare parts for the maintenance and repair of this element

Which room for which use?

For maintenance and repair of your swingarm, you will need several types of spare parts, including bearings, bushings, seals, etc. It is essential to choose quality parts to ensure optimal operation of your swingarm.

Choose quality parts

It is important to choose quality spare parts to guarantee the longevity and proper functioning of your swingarm. Do not hesitate to opt for branded parts, which generally ensure a better lifespan and better behavior for your motorcycle.

In conclusion, the swing arm is an essential element of the rear suspension of your two-wheeler. Its choice, maintenance and repair require a certain amount of knowledge and attention. Guarantor of your comfort and safety, it deserves to be chosen with care and maintained regularly to fully enjoy your 125 motorcycle rides.