DT Swiss 180 EXP StraightPull CenterLock Disc Hubs. Features: Ratchet EXP (36t) features a fused threaded ring/ratchet and single spring, reducing the number of components for a lighter and more durable freehub system Integration of drive side bearing into threaded ring widens bearing stance, resulting in 15% greater hub stiffness With DT's ratchet system, all of the teeth on each side of the ratchets engage simultaneously every time. This creates much smaller point loads and results in the legendary reliability of Ratchet System hubs Hub shell is machined to achieve the lightest possible weight SINC ceramic cartridge bearings Center Lock disc Refined end caps allow for easier disassembly HG 11sp road: Compatible with HG splined Shimano/SRAM 11sp cassettes. Also compatible with Shimano/SRAM 8-10sp cassettes with spacer DT Swiss spoke calculator: https://spokes-calculator.dtswiss.com/en/calculator Specs: F R:rear (HG 11sp road) Axle Spacing Mm:12x142 TA Hole:28h Color:black/black Weight:188g