First, check whether the product provides 2-3 inches of elevation requirements, some products only provide 2 inches of height, barely used to 3 inches of elevation after it is easy to pull to the limit in off-road to cause damage.

Second, whether the diameter of the telescopic rod in the center of the shock absorber can reach more than 16 mm, which is a basic indicator of strength.

Third, whether the upper and lower connection sleeves of the shock absorber are high-strength polyurethane sleeves, which is also an important basis for ensuring long-term high-intensity use, because ordinary rubber is difficult to use for a long time under high strength.

Shock absorbers are mainly used to suppress the shock when the spring absorbs shock and bounces back and the impact from the road surface. When passing through uneven roads, although the shock spring can filter the vibration of the road surface, the spring itself will have reciprocating motion, and the shock absorber is used to suppress this spring jump. If the shock absorber is too soft, the body will jump up and down, and if the shock absorber is too hard, it will bring too much resistance and prevent the spring from working properly. Shi Xiaohui said that in the modification process of the suspension system, the hard shock absorber should be matched with the hard spring, and the hardness of the spring is closely related to the weight of the car, so heavier cars generally use harder shock absorbers. Constant experimentation is required when retrofitting to design the best combination of shock absorber and spring. Professional tuning shops can generally find the best match for car owners.