Spank 359 Vibrocore 27.5" rear wheels are laced to the brand new SPANK HEX Drive Hub, with 102T 6-pawl ratchet offering 3.5 degrees of engagement - that's literally almost instant pick-up. The low profile, radially compliant alloy rim injected with SPANK's award-winning Vibrocore to add torsional strength and lateral stiffness, offers a smooth and highly responsive ride feel. Hand-built to A-Class specifications, the 359 Vibrocore wheels with SPANK Hex Drive hub is the premium offer from the SPANK wheelhouse and is trusted by pros on the UCI DH World Cup circuit, as well as big mountain free-riders. This wheel is spec'd and built for the heavy hitters.