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 dampeners on the order The combination provides superior dampening, and excellent ride control Bagger unit uses Progressive Suspension FST, Frequency Sensing Technology for the smoothest ride Improved resistance to front brake dive Improved cornering Improved bottoming controls Includes one high performance, gas charged Mono-tube fork cartridge completed with opposite side Progressive Suspension famous fork spring 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 Stock height