Brock's Performance Dyna Swingarm 00-17 - Machined If you're building a Performance Dyna, then we have the perfect swingarm for you! Handcrafted 6061-T6 aluminum extended swingarm Proprietary custom extrusion made exclusively for Brock's Performance Adjustable wheelbase, from stock location up 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 spacer size for the model year Dyna:11/16” - Model Years 2000-20053/4” - Model Years 2006-2017 Interior swingarm width measures 10 5/8” at the axle The total weight of swingarm, hardware, and axle is 14.78 lb. (6.70 kg)(see the 'Technical' tab for details) Designed, machined, and assembled in the USA Burnished raw aluminum finish See 'Technical' tab for installation information Click here to view installation information Click here to view pivot bolt stack-up engineered drawing Overall hub width is critical for proper operation/handling, see 'Technical' tab for important information regarding installation