Unique Ultra spring configuration provides the superb ride quality and suspension travel of a 13" shock but the custom lowered look of a 12" shock Low Series shocks are designed to sit even lower; 2" lower than a stock Touring model Built around Progressive Suspension's Frequency Sensing Technology (FST) Allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality Unique spring combination delivers a dropped ride height while being ridden, but also while the bike is on a side stand This allows you to better manage your bike at intersections and when parking Adjust spring pre-load by hand, no special tool needed Progressive rate main springs specifically designed for touring models High-pressure gas charged for consistent performance Heavy Duty Applications recommended for bikes operating at or near maximum load rating over 50% of the time. Before purchasing or attempting to install shocks that are different than the OEM length, confirm that your wheel travel can be altered without causing clearance issues, such as swingarm/axle to exhaust contact as well as chain/belt guard or tire contact.. SHOCK 944 FLH SUPER DUTY