The M-125 3" Wheelie Bar Wheel includes the Wheel, 2 Bearings, 1 Spacer, and 2 Washers and now comes with the bearing installed. The wheel is 1 1/4" wide, 3" in diameter and has a 1/2" ID hole. With the spacers added, the width of the assembly is 1 1/2". Also available are Wheelie Bar kits.