The Kit includes
Front : 2 x 6901-2RS
Rear : 1 x 6901-2RS / 1 x 6902-2RS + 2 x 15267-2RS
ceramic bearings for one front and one rear hub.
Bearing Material: Chrome Steel 52100
Ball Material: Ceramic SI3N4
Enclosure #: Two Seals
Enclosure Material: Rubber Seal
Lube: Kluber NBU12/300KP
China Ceramic Manufacturer bearings have a proven lifetime which is 3-5 times longer than standard wheel bearings, reducing the need for bearing maintenance.