Race-developed and tested in World Superbike, World Supersport and AMA Superbike competition, Improved design features a fork cartridge that uses a sealed, one-cylinder piston chamber that allows oil flow only through the shim stack on the cartridge piston when compressed, Kit uses a larger, 30 mm diameter piston that flows more oil that allows for a wider range of adjustment, This provides immediate suspension response and generates optimal suspension oil pressure all the way through the fork damping sequence, All damping adjustment knobs are at the top of the fork caps for easy suspension tuning (compression on left fork leg, rebound on right leg; both have spring preload adjustment), Easy to tune, For use with OEM fork tubes