It's our job to make the best riding hubs in the industry, and 142mm x 12mm rear hubs are THE standard for road disc and gravel bikes, so we poured our hearts and souls, not to mention an awful lot of engineering, into this hub. We think it's the best all-around disc hub on the market.Feature:- Patented RingDrive™ system with 45 simultaneously engaged points of contact for virtually drag free engagement- Available with Shiamano/Sram HG or Sram XDR driveshell- 142mm x 12mm thru axle rear- Easily serviceable and completely re-buildable with our R45 Hub Service Tool- Ceramic bearing upgrade available- Available in 24h, 28h, and 32h- Lockring is sold separately (PHB355) and is required for rotor installation on rear hubSpecifications:- Axle Width: 142mm- Flange Diameter DS & NDS: 57.4mm- Center to Flange DS: 18.7mm- Center to Flange NDS: 33mm