Motorcycle development has extended a variety of styles, and its structure is different, such as most straddle motorcycles are double rocker arm design, but now more and more are using the relatively rare single rocker arm. Before we understand the single rocker arm, we must first understand what the rocker arm of the motorcycle refers to.

The rocker arm of the straddle motorcycle is also known as the rear flat fork, which is a part that links the frame, shock absorption and tires, has the role of fixing the rear wheel and supporting the body, and the rear flat fork is not as immobile as it seems, but can move up and down with the vertical pressure. But if your motorcycle rocker arm can swing from side to side, it's time to check it out at a repair shop.

In this way, we can know that the double rocker design has symmetrical link points on both sides, and the single rocker arm is also well understood, that is, only the rear wheel is fixed on one side, and the opposite side is empty. Therefore, the single rocker arm design of the straddle bike can achieve lightweight and easy replacement and maintenance, but it is mainly for appearance reasons for ordinary commercially available cars.

Why the above also specifically pointed out the straddle riding, it is because the scooter rocker arm and straddle riding is different, the scooter rocker arm is actually by the engine and gearbox as this connection component, the current circle on the pedal whether there is a single and double rocker arm has been debated.

However, it is certain that the unilateral link of the rear wheel of the scooter cannot provide the convenience of removing the rear wheel, nor can it achieve the goal of reducing the unsprung quality ‌‌. Therefore, pedal motorcycles are exactly the opposite of straddle motorcycles, most of them are large displacement using double links, and small displacement 125 is generally a single link structure.

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