These GPM BR102F front adjustable spring dampers are machined to leverage 6061-T6 aluminium for a balance of low mass and structural rigidity, aimed at reducing internal friction and optimising balance during high speed use. The package preserves the original spring wire diameter of 1.3mm while upgrading the shock shaft section from 3.0mm to 4.0mm to improve resistance to bending under impact and sustained loads. The aluminium shock cylinder provides a robust, lightweight housing and the spring retainer is tightly sealed to minimise oil leakage. Adjustment is provided via the top spring retainer so you can set spring hardness for specific setup or terrain requirements.