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Spring preload adjustment or adjustable spring screw. With the threaded cylindrical shock absorbers, the user can turn the preload to properly tune the spring and tighten a provided bolt to secure the ring in place.
The Rebound Adjustable is for controlling the shock absorber's rebound, fast 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.