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The versatile Stan's NoTubes’ Arch EX 27.5in Boost Wheelset is built to hang tough with gravity diehards, yet is light enough to be heralded among XC racers. Stan’s NoTubes designed the Arch Ex with patented Bead Socket Technology (BST), which utilizes low-profile sidewalls to give you an air-tight seal with a more secure seat for the tire bead. BST allows the tire to maintain its intended (more efficient) profile, delivering you a more responsive platform with improved traction and less rolling resistance. For added stiffness and durability, Stan’s NoTubes integrates an internal arch to reinforce the rim. The Arch EX wheelset features Stan’s all-new Neo hubs, which utilize larger bearings and a stiffer axle to provide strong, reliable performance. The Neo’s lightning-fast engagement comes courtesy of four precision engineered pawls and a 36-tooth ratchet ring. Stan’s new SealLock endcaps ensures quick installation and the Slip-Fit axle offers easy conversion.