A-2878-I-AI Cone, Tapered Roller BearingOne New Aftermarket Replacement Cone, Tapered Roller Bearing 2878 Series This tapered roller bearing cone (inner ring assembly) is a single row, Type TS bearing in the 2800 series. The cone pairs with a separately purchased cup (outer ring) to form a complete tapered roller bearing assembly capable of handling both radial and axial loads. It is typically mounted in opposing pairs on a shaft and is widely used in agricultural equipment, construction