
This Shimano Ultegra 6800 11 Speed Rear Hub is a cold forged aluminium hub for serious road cyclists. With enhanced sealing performance through the use of low friction Labyrinth & contact seals, & an internal grease sleeve. Using a special Boron Nitride machining process that has been applied to the cones to make them rotate super smooth. The Ultegra 6800 rear hub is a light & hardwearing bit of kit available in 32 & 36 hole.