Autobahn AB-S Skateboard Wheels White, 99A Durometer Formula, 4-Pack A99, in 52mm and 54mm sizes. Upgrade your skateboard with Autobahn AB-S wheels. Offering a high quality 99A durometer formula, these 4-pack wheels come in two sizes, 52mm and 54mm. With these wheels, you can expect top performance for all your skating needs.