Previous iterations of our hubs needed to balance compatibility with evolving external technologies, like the SRAM and Shimano drive systems, with our patented internals and bearings. With those core systems having stabilized, it gave us an opportunity to rethink what was going on inside our hubs, and so we took the chance to simplify things for our riders and streamline manufacturing. For Gen 4 we undertook a holistic development process for each of the three hub products Boost CenterLock/6-Bolt, R45D, and R45, collapsing the specs into a design that allows for a universal axle and internal parts.
Notably, Chris King points out that 'this is not a performance-based evolution.' Essentially, the hubs now use universal parts which allow King to offer drive system conversion kits for just $80.
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