FSE 260 version 2 free hubs feature a new steel wear plate for Shimano-fit freehubs, essentially an “anti-bite” guard. Why? The low splines of Shimano’s freehub design are subject to huge stresses from the cassette, which is why Shimano makes most of its freehubs from hard steel. Steel is heavier than aluminum, so many aftermarket manufacturers choose to use the latter for their freehubs, despite its susceptibility to damage from cogs digging into the splines. An anti-bite guard attempts to address this, with minimal weight gain.