This is an optional XRAY Progressive Long Rear Shock Spring Set, and is intended for use on the rear of the XRAY XB808 and XB9 1/8 buggies. Long progressive springs are soft at the beginning of the compression but become harder as the spring is compressed more in the middle, with highest hardness at the end. These ultimate high-performance racing springs give you additional precision tuning options for your XRAY model racing car. Developed through extensive testing and racing experience, these racing springs were designed and precision-crafted to have a more progressive rate than standard XRAY racing springs. As the car enters the corner the spring is softer which generates more grip, but as soon the car inclines the springs get stiffer and a higher cornering speed is achievable.
These springs are individually measured, controlled, inspected, and matched to provide identical damping characteristics. During the selection process, each spring is compressed in several fine increments and the values are recorded. Then each spring is matched with another spring of identical characteristics. XRAY goes the extra mile to ensure perfect spring matches, giving your car the predictability and consistency that you need to help you lead the pack.