Lone Star Racing Swingarm - Rear - Silver - +4in. Length 15-4220041121 Super strong, TIG-welded 4130 chromoly steel swingarms withstand the punishment of racing and aggressive riding Available in different lengths to suit a wide variety of applications Shorter swingarms improve steering agility; longer swingarms provide enhanced stability and traction Compatible with Works Performance Shocks Feature round housing for easy chain adjustment