The adjustment of the air pressure shock absorber mainly lies in two aspects, one is linear and the other is preload. The preload is also what we often say SAG. It is the amount of preload that the suspension stroke sinks after you step on the vehicle.
The purpose is to allow the shock absorber to extend the space to compensate for the pits and depressions of the road surface.
Then the preload can be divided into static and dynamic. The former refers to the amount of preload when the driver maintains a fixed posture, while the dynamic preload is the average amount of preload when the driver steps on and glides; the former is determined by the spring force, and the latter We also need to add damping adjustment to make a joint decision.
When setting the preload, first adjust the damping force of the shock absorber to the minimum, then step on the vehicle and move the center of gravity to the middle of the two wheels, and press down firmly on the shock absorber to observe the travel position after returning. Generally speaking, it is better to set the preload between 25-30% of the total stroke, depending on the frame recommendations and personal preferences. The accuracy of preloading is very important. Too little will result in insufficient extension range and reduced traction; too large will cause the vehicle to sink excessively, and the stroke is easily consumed quickly.
In most cases, it is recommended to set the same preload before and after, but if you are a downhill user who is purely pursuing speed, you can try to increase the preload of the rear wheel to 35-40%, while the front fork still maintains the original setting . On the one hand, the center of gravity can be shifted back properly, and in addition, the pass-ability of the rear wheel can be improved, which prevents the rear wheel from bouncing and turning forward when rushing through bumps or flying bags at high speed. In fact, many professional drivers do this.