Niner Jet 9 RDO suspension bearing kit for V2.0 and 2.1 frames. Contains 8 pcs Enduro MAX sealed cartridge bearings with black oxide anti-corrosion bearing race treatment. Jet 9 RDO V2.0 frames were manufactured from 2016* through 2018 and V2.1 frames were manufactured in 2018 and later. *NOTE: There were some V1.2 Jet RDO frames manufactured in 2016 and those frames take a different kit.