These offset belt pulleys, matching pulley inserts and sprocket covers were developed by Rick's to allow installation of up to 240mm tire widths on 2004 and later Sportster. In addition to widening the OE swingarm, the belt drive also has to be relocated to the outside in order to be able to guide the belt along the wider tire. The open engine sprocket cover replaces the stock cover and the pulley insert is bolted to offset front belt drive sprocket and rotates when riding. Engine sprocket cover, offset belt pulley and pulley insert must always be used together. However, all items are to be ordered separately.