Part number: 970-2004BHigh-pressure gas-charged dampers use deflective disc valving Packaged in a hard-anodized aluminum body High-performance dampers are wrapped in a progressive rate spring with a threaded preload adjuster Remote reservoirs mount in front of the bags and allow for easy compression tuning Heavy Duty Applications recommended for bikes operating at or near maximum load rating over 50% of the time. Before purchasing or installing shocks that are different than OEM length confirm wheel travel can be altered without causing clearance issues such as swingarm/axle to exhaust contact and chain/belt guard or tire contact.