DT Swiss 370 DJ 6B Disc Rear Hub 32h 10x135mm nuttedClassic flanged DJ hubs feature a 6 bolt disc rear and non disc front With DTs Ratchet LN system (36t), 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 Rear hub includes 12t sprocket DT Swiss spoke calculator: https: spokes calculator. dtswiss. com en calculator Specifications: Model 370 Front Rear Rear (12t) Axle