Features: Tapered roller bearings consist of an outer ring, inner ring, rollers, and a cage. This bearing contains tapered rollers as the rolling element, 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 contact surface of the rollers are designed so that their respective apexes converge at a point on the bearing center line. Kits include specially designed seals to help keep water and dirt out while retaining grease. Products are tested by model, and installation and functional aspects comply with industry standards. Specifications: Material: Metal Size: As shown in picture for CRF 50cc - 250cc Item: 91683/22.5 & 91683/24 Bearings Type: Tapered Roller Pressure Bearing Inner Diameter: 22.5 mm Outer Diameter: 41 mm Model: 91683/24 Inner Diameter: 24 mm Outer Diameter: 41 mm Grade: ABEC-1 Quality: Standard Note: 1. Please allow 1-2 cm errors due to manual measurement. Ensure you are comfortable with this before ordering. 2. Due to differences in monitor displays, the picture may not reflect the actual color of the item. Thank you for your understanding. Package includes: 1 Set Bearings