Progressive Suspension PS-31-5056 Preload Adjusters Black for Dyna 06-17/Touring 14-Up/Softail 18-UpThe Progressive Suspension 49mm Fork Preload Adjuster Kit is a great thread in solution to improve front suspension performance. Add preload to stiffen up the front fork for aggressive riding in the canyons. Decrease preload to soften the suspension for a day of comfortable cruising. The ability to change preload settings also provides improved front suspension performance when going from a single rider to a rider with passenger configuration. The PS