PROGRESSIVE SUSPENSION 444 Series Shock - Black - Heavy-Duty - 13" 444-4020B

Feature the all-new Frequency Sensing Technology (FST) which allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality, Deflective disc valving, Adjust spring pre-load by hand, no special tool needed, Include a progressive-rate spring and are high-pressure gas charged for consistent performance, Shocks slightly longer than stock may alter head angle slightly and provide quicker steering., Shocks slightly shorter than stock may alter head angle and provide slower steering., Before purchasing or attempting to install shocks different than OEM length, confirm your wheel travel can be altered without causing clearance issues, such as swingarm/axle to exhaust contact and chain/belt guard or tire contact., Heavy duty applications recommended for bikes operating at or near maximum load rating over 50% of the time.