FH-RS400 Rear Hubs Cone races ground by a Cubic Boron Nitride tool for smooth rolling durability. Internal o-rings and grease sleeve to help maintain grease levels and increase service life. Item Specifications: Color: Black, Weight: 385, Hub Drilling: 36, Cassette Body Type: / 11 Speed Road, Bearing Type: Loose Ball, Skewer Included: Yes, Defined Color: Black, Spoke Interface: J-Bend, Rear Axle: QR x 130mm, Hub/Brake Compatibility: Rim Brake, Center to Flange, Left: 36.6, Center to Flange, Right: 17.1, Flange Diameter, Left: 45, Flange Diameter, Right: 45,