ISO Disc Brake Hub Rear 135 mm Shimano Compatible (Classic Model)Our Classic rear ISO disc hubs are available in 24, 28, 32, 36, 40, and 48 spoke hole configurations. We also offer our rear ISO disc hubs with 2 bearing options: Standard Phil spec bearings which have full contact seals and have a 100% fill with our Phil Waterproof grease. Carbonyte Phil spec bearings are our low drag bearing option which have partial contact seals and have a 30% fill with our full synthetic Phil Carbonyte grease. Our 11 speed