These bearings feature a new treatment process that has been track proven to make the bearings last longer. New style seals allow for less drag while still keeping the dirt out. Lastly, the bearings come all ready to go with DAYlube low drag grease in them. Between the bearing treatment, seals, and low drag grease, these babies spin nice. We will still keep selling our RF85 bearings also as they are a proven commodity.
28mm or 32mm