Progressive Suspension 440 Series motorcycle Shock Absorbers
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Progressive Suspension 440 has the special I.A.S inertia active system which seperates wheel movement from chassis movement.
Every product line has a “best of the best” and the PSI 440 Series shocks are just that. We wrap our proven progressive rate spring around a state of the art damper and top (and bottom!) it off with machined aluminum end caps. A top mount threaded preload adjuster allows for fine tuning with a simple twist of the cap and the 440 Series is available in 2 finishes and multiple spring rates as well as the ideal stock or lowered length for your bike.
I.A.S. (Inertia Active System) separates wheel movement from chassis movement