Size: 50mm x 18mm / 4pcs Wheel Size: 50mm Material: rubber Wheelbase: 120 mm Rim width: 2 centimeters About this position The diameter of this luggage wheel is 50 mm / 1,97", the rim width is 18 mm / 0,71", the total wheel width is 21 mm / 0,83 ", and the inner diameter of the center bearing is 6 mm / 0,23". The package includes 30 mm and 36 mm axes and washers to meet different needs of 30 mm and 36 mm. Set of 4 interchangeable wheels do luggage case, integrally molded, more durable and quieter. Each package includes 4 x wheels, 4 x 30mm axles, 4 x 36mm axles, 8 x axle bolts, 8 x washers, 2 x keys. Product Description 4 pcs. 50 x 18 mm spare wheels do luggage case No matter what you need, 30 mm, 33 mm, 36 mm, this set of spare wheels do luggage suitcase will meet your needs. Features: Wheel outer diameter: 50mm Wheel Width: 18mm Bearing Inner Diameter: 6mm Axles: 30mm, 36mm (head not included. ) Packages: 4 x Wheels 4 x 30mm axles Axles 4x36mm 8 x Axle Screws 8 x Washers 2 keys