For serious racers hunting for smart fat cost savings and optimized rotating weight, XRAY's new optional lightweight 1st gear drive flange created from 7075 T6 aluminum has been strategically lightened (compared to the standard #335530 flange) to cut back rotating fat without having to sacrifice strength or durability. Includes factory-pressed top-notch German 1-way bearing, hand-ground for optimum running precision and energy. The 1-way bearing is non-replaceable as soon as exhausted, so that it needs to be regularly serviced, cleaned, and oiled regularly (we recommend making use of #309580 One-way Lube). Orange color.