OES Micro Sprint Sprocket Carriers are fully radiused and pocketed for maximum weight savings and strength. Precision splines keeps your JOES parts spinning true great performance. 1¾”-27 spline. Available in 1/4″ and 5/16″ Bolt Size application. Both have 6 on 5¼” bolt circle. Both carriers are supplied with a flange nut (sprocket applications) and stove nut (brake application).