Drop in on any trail with confidence on the Industry Nine Hydra Enduro S 27. 5in Boost Wheelset. By combining the high-engagement Hydra hubs with the proven rim profile of the Enduro 305, these wheels provide a responsive feel at the pedals and the rugged reliability you need to rip all-mountain terrain day in and day out. The I9 Hydra hubs are the snappy new hub option on the block, offering 690 points of engagement that propel you forward with an impressive 0. 52-degree engagement, for one of the fastest hubs we've seen to date. They're laced up to I9's beefy Enduro S rim, providing a solid platform to tackle black diamond runs and all-day epics in the backcountry. And since they're constructed with 28 straight-pull steel spokes instead of the aluminum found on the 305's, you can enjoy them at a more approachable price that leaves you with extra cash for other upgrades, or even a few race entry fees. The Hydra hubs build on Industry Nine's previous drive system, featuring a 6-pawl design like the Torch hubs, but the drive ring is boosted up to 115 teeth as opposed to the 60-tooth design found on Torch. The pawls are also independently phased, engaging in procession as the axle rotates, which allows the aforementioned 690 points of engagement with just 0. 52-degrees between each engagement point. While this provides near-telepathic response when you apply force to the pedals, one of the primary benefits is increased durability. With the Hydra's independently phased system, you have one leading pawl that starts to take the load from pedaling, but because the pawls are phased close together and the tooth count is so high, as soon as you apply torque to the system a second, third, and sometimes even a fourth pawl start taking some of the load to disperse the force more evenly. Basically, Hydra uses the inherent flex in the drive system to ensure that a single pawl will never take the full load, minimizing wear and tear on the freehub body and drive-side bearings.