Tapered roller bearings consist of an outer ring, inner ring, rollers, and cage.This bearing uses tapered rollers that are guided by the inner ring backface rib on the roller's large end face.The raceway surfaces of the inner and outer rings and the rolling elements are designed so that their respective apexes converge at a single point on the bearing center line.The bearing is equipped with specially designed seals to keep water out and retain grease.The product has been tested for model compatibility, installation, and functional performance in accordance with standard specifications.Material: Metal Size: As shown in picture Suitable for 50cc - 250cc motorcycles and bikes Item: 91683/22.5 & 91683/24 Bearings Type: Taper Roller Pressure Bearing Specifications: Inner Diameter: 22.5 mm Outer Diameter: 41 mm Model: 91683/24 Inner Diameter: 24 mm Outer Diameter: 41 mm Grade: ABEC-1 Normal Quality Package Includes: 1 Set Bearings