This Single Sided swingarm is constructed from beefy, heavy gauge steel tubing and allows you to fit an up to 250 series rear tire on an 8.00 x 18 or 9.00 x 18 wheel. This swing arm fits a stock style Evolution Softail or Twin Cam Softail frame in conjunction with a 25mm primary offset kit. For Evolution models you can use a 25mm primary offset ring with crankshaft extension with nut and 25mm offset transmission mounting plate or ZPN700889 offset kit. Twin Cam Softails through 2006 need ZPN700889 primary offset kit that features an extended transmission main drive shaft and 25mm extended main drive gear. 2007-up 6 Speed Twin Cam Softails use our latest ZPN701950 offset kit. The swingarm kit includes a polished rear disc brake rotor, polished 4 piston PM brake caliper with bracket, polished 20mm wide rear pulley and the stock type spherical swingarm bearings. The included trick caliper mounting bracket allows you to fit the caliper in down or upright position without the need of a separate brake torsion arm. The polished 20mm rear pulley features hard anodized and Teflon coated teeth for X-tra long running time. Due to the variety of applications the swingarm the primary offset kit and other required parts must be ordered separately. Kit needs to be used with 2007 type 20mm rear belt. Note: All parts in the offset kits are separately available. Note: Primary offset kit for 2012-2013 models also fits earlier models that are equipped with a Screamin' Eagle compensator OEM 40274-08 or 40274-08A. These feature only 1 thrust washer between the sprocket and sprocket retainer. Kit for 2014 to present models also fits earlier models that are equipped with a Screamin' Eagle compensator OEM 36500034A, 40100061, 4220064A or 42200095A. These feature a thrust needle bearing and 2 washers between the sprocket and sprocket retainer.