Take your suspension to the next level with these high performance, tunable,monotube cartridge fork shocks Based on Progressive's proven monotube fork cartridge design Enjoy improved front end control and ride comfort by converting your archaic dual damper rod forks to true high performance monotube dampeners Asymmetrical design places a preload adjuster over a progressive rate spring in one leg, and an aluminum bodied, sealed cartridge dampener on the order The combination provides superior dampening, and excellent ride control Adjustable preload Improved resistance to front brake dive Improved cornering Improved bottoming controls Includes a pair of high performance, gas charged Mono-tube fork cartridges complete with a set of Progressive's famous fork springs This kit is a direct internal component replacement No modification to your forks are required Improved resistance to front brake drive, front end stability, cornering and bottoming control