Polygon & Marin bearing kit A: These bearings have an anti-corrosion black oxide finish to give you maximum life out of your replacement bearings. This kit fits the following bikes, Bike Model Type Year Marin Mount Vision 2014-2017 Marin Rift Zone 2015-2017 Marin Hawk hills 2017-2022 Marin B-17 2018-2019 Marin Rift Zone 2018-2022