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Cradle frame: it is characterized by that the installation state of motorcycle engine is the same as that of a baby being put into the cradle of the frame, so it is called cradle frame. The frame of this kind of space structure is also much better in compressive strength and stiffness, so the motorcycle with high power. This kind of frame is widely used in high-speed racing cars.

Cradle frame can be subdivided into

(1) double tube cradle frame: from the frame to the riser to the lower part of the engine, it is equipped with two side-by-side steel pipes.

(2) fork tube cradle frame: a single steel tube is connected with the steering riser of the frame, and two steel tubes are arranged side by side under the engine.

(3) the cradle frame composed of single steel tube is called single tube cradle frame.

The difference in the use of these three kinds of frame is (that is, the choice of frame in the development of the finished vehicle): choose the corresponding frame according to the different structure of the engine. In addition to the size and shape of the engine, the most important factor is to better and more reasonably place the exhaust pipe and intake pipe of the engine. For example, the exhaust pipes of two cylinder and four cylinder engines are separated on both sides, and it is usually easy to choose fork shaped or single tube frame. The exhaust pipe of three cylinder engine is placed in the middle and on both sides, and the double row pipe frame is often used. Single cylinder engine also uses double tube frame or fork tube frame.

Cradle frame not only has ideal compressive strength and stiffness. At the same time, it has beautiful appearance and powerful feeling, which is conducive to the structural arrangement of the finished car. However, the production and processing technology of this kind of frame needs higher requirements.

Bridging rhombic frame: it is characterized by omitting the frame part under the engine, and can directly use the stiffness of the engine itself as a part of the frame to connect the frames with each other. Therefore, this kind of frame is formed by bridging the discontinuous part of diamond with the help of engine, so it is called bridging diamond frame

Because this kind of frame takes the engine body as a component of the frame, the vibration and impact carried by the frame is the vibration and impact that the engine body will suffer. Therefore, its disadvantage is that the engine crankcase may deform and affect the performance of the engine. The utility model has the advantages that the material under the frame is omitted, the total weight of the frame is reduced, and the structure is simple. It is mainly used for motorcycles with medium displacement, especially for off-road vehicles. In addition, in order to better obtain the ideal minimum height above the ground, this kind of frame is also more used. In large displacement motorcycles, the problem of connecting compressive strength of engine is solved, and this kind of frame is gradually selected.