Handcrafted 6061-T6 aluminum extended swingarm Proprietary custom extrusion made exclusively for Brock's Performance Extends wheelbase from stock to 3 inches over 3-position shock mounts allow flexibility in ride height (stock, -1”, -2”) Designed for use in high-power, high-torque applications Includes centerless ground 4130 Chromoly axle (choose from 3/4”, 25mm, 1”, or 28mm axles) Reversible billet aluminum axle adjusters for easy wheel adjustments Select from one of two caliper mounting options: Undermount - For Aftermarket Calipers OEM - For using the OEM Dyna Caliper and Mount (select the correct axle size for your caliper mount) PTFE® lined spherical bearings from Worldwide Bearings preinstalled Select bushing size for the model year Dyna: 11/16” - Model Years 2000-2005 3/4” - Model Years 2006-2017 Interior swingarm width measures 10 5/8” at the axle The total weight of swingarm, hardware, and axle is -- lb. (-- kg) (see the 'Technical' tab for details) Designed, machined, and assembled in the USA Burnished raw aluminum finish Also available without passenger peg mounts Also available in a black finish. Please note year and model at time of purchase, as well as axle size desired (if different from stock) and options desired (chain guard, delrin sliders, black or aluminum finish etc.)