South Carolina-based wheelset company Boyd Cycling has announced at this year's North American Handmade Bicycle Show its own range of lightweight road hubsets called Eternity. The clever design features ultra-wide bearing and spoke flange spacing along with one-piece axles that span both dropouts from end-to-end. Claimed weight is just 326g for the set while the rear hub’s internal layout also cuts bearing friction roughly in half.
Both the front and rear Eternity hubs have notable features but the biggest news resides out back.
The vast majority of modern four-bearing rear hubs use the same layout with one cartridge at either end of the hub shell to support the axle, and then two more way out on the driveside for the freehub body. Much like Easton has done with its new Echo hubs, however, Boyd’s new Eternity rear hub instead supports the axle at the very ends, which puts less stress on the axle and, at least in theory, yields a stiffer wheel overall.
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Instead of supporting the axle primarily at the non-driveside end and roughly in the middle, the new Eternity hubset pushes the main axle bearings all the way out to the ends
The freehub body spins on its own pair of cartridge bearings as usual but not directly on the main axle like with conventional hubs. As on the Easton, the Eternity freehub rotates around its own completely separate, extra-oversized stub axle. In this case, Boyd uses a precision-machined aluminum tube that is screwed into the hub shell whereas Easton integrates the extension as part of the hub shell itself.
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