Motorcycle Suspension JC Whitney: Motorcycle Parts & Accessories
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Suspension
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PROGRESSIVE® SUSPENSION 420 SERIES NON-RESERVOIR, INTERNAL BLADDER, ALUMINUM BODY SINGLE SHOCKS The 420 Series from progressive suspension allows for easy shock installation without the need to find a location to mount a reservoir. The internal bladder is gas charged with nitrogen to give superior fade-free damping. The shock shafts are made from 14mm chromoly steel, hard chromed for durability and smooth operation.
PROGRESSIVE SUSPENSION 450 SERIES I.A.S.® SINGLE SHOCKS The 450 series I.A.S. ® single shocks have technically the same features as the 440 Series. These 450 series I.A.S.® single shocks include a progressive® rate spring and an inertia sensitive and velocity sensitive damping circuits.