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Spring preload or adjustable spring bolt. With the threaded design of the cylindrical shock absorbers, the user can adjust the preload to finely tune the spring and tighten a provided bolt to secure the ring in place.
The Rebound Adjustable feature is for controlling the rebound of the shock absorber. It can be quick or slow depending on the driver's needs.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.