Black Inc. XDR Driver Freehub BodyThe XDR Driver Freehub is available either with CeramicSpeed ceramic Bearings or stainless steel bearings. We work directly with CeramicSpeed for all our hubs, which is why we offer the XDR with ceramic bearings as an option. CeramicSpeed bearings are based directly on the technology developed as part of NASAs space program in the 1990s. CeramicSpeed bearings are produced using top grade Silicon Nitride ceramic balls which provide an instant upgrade
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