. The Shimano RS505 CL Disc Rear Road Hub is designed for Road & Cyclo-Cross riders that are using disc brakes. It features enhanced sealing performance & internal grease sleeves that combine to produce an incredibly smooth & durable hub. enhanced sealing performance through the use of low friction Labyrinth & contact seals, & an internal grease sleeve Designed to be used with either Centre-Lock Disc rotor mount for secure hassle free setup or regular rim brake Special Boron Nitride machining process is applied to the cones for super smooth rotation Can be used with aero & standard spokes Cold forged aluminium hub shell with anodised finish Comes complete with Quick Release skewer 135mm over locknut dimension Designed for 11-speed cassette A 2 year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace & XTR products) Buy Shimano Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.