Aero grade 7075-T6 alloy, and the cog is reinforced by a special treatment, in order to increase the longevity. This provide an alloy cog that is harder than steel cogs. They are available in two colours, the classic black and signature smoked champagne.
Splined Version: Designed with 16 splines, with no sharp edges to distribute the effort equally all around the hub body. Alloy cog that is harder than steel cogs!