Springs can be divided into the following 6 categories:

1. Processed into various shapes of torsion arms instead of hooks. Torsion springs use the principle of leverage to twist or rotate elastic materials that are soft and have high toughness, giving them great mechanical energy.

2. A tension spring is a spiral spring that bears axial tension. When not under load, the coils of the tension spring are generally tightly connected without any gap between them.

3. Compression spring is a spiral spring that bears axial pressure. The material cross-section used is mostly circular, and it is also made of rectangular and multi stranded steel coils. The spring is generally of equal pitch, and the shapes of compression spring include cylindrical, conical, convex and concave, and a small amount of non circular. There is a certain gap between the coils of compression spring, and when subjected to external load, the spring shrinks and deforms, storing deformation energy.

4. Progressive spring, this type of spring adopts a design with inconsistent thickness and density. The advantage is that it can absorb the undulations of the road surface through the lower elastic coefficient when not under pressure, ensuring a comfortable ride. When the pressure increases to a certain extent, the thicker part of the spring plays a supporting role in the vehicle body. However, the disadvantage of this type of spring is that the handling feeling is not direct and the accuracy is poor.

5. Linear spring, with a constant thickness and density from top to bottom, and a fixed coefficient of elasticity. This type of spring design can provide a more stable and linear dynamic response for the vehicle, which is beneficial for the driver to better control the vehicle. It is often used in performance oriented modified and competitive vehicles, but the downside is that comfort is affected.

6. Short springs are shorter and more robust compared to original factory springs. Installing short springs can effectively lower the center of gravity of the vehicle, reduce roll during cornering, make cornering more stable and smooth, and improve vehicle cornering handling. The damping setting of the original shock absorber leans towards comfort, so the combination of the short spring and the original shock absorber is not very stable. It cannot effectively suppress the rebound and compression of the short spring. When driving on bumpy roads, there will be an uncomfortable jumping feeling. Over time, the lifespan of the shock absorber will be greatly reduced, and there may also be oil leakage. Of course, the above conditions are relative. There won't be such serious damage during daily driving, and it's best not to drive aggressively, as original shock absorbers cannot withstand high loads of pressure.