30207 Taper Roller Wheel Bearing, it ables to carry radial and axial load in one direction simultaneously (cone + cup), Bearing is made of Chrome Steel. Item: 30207 ball bearing Type: Taper Roller Wheel Bearing Size: 35mm x 72mm x 17mm Inner Diameter: 35mm Outer Diameter: 72mm Width: 17mm Quantity: One Bearing (cone+cup) Basic load ratings Cr: 51,200 N Basic load ratings Cor: 56,000 N Limiting Speed: Grease Lubrication: 5,300 RPM Oil Lubrication: 7,000 RPM