Wheels are made with roller bearings the outer rim of the wheel is machined flat and smooth as opposed to tapered like rough casting on most Patterned from antique wheels to provide an authentic old style look. Wheels – 8″ diameter by 2″ wide Color: silver. Feature: 3/4″ Roller Bearing with 1/2″ ID Bushing So you can use a 3/4 axle Or 1/2 axle. These are the same wheel shopdogsam uses on his engine carts See them on YouTube at shopdogsam. Look at the pictures they are part of the description. Check out my other listing.