First quality, precision wheel rims CNC machined and polished from aircraft grade aluminum. Doesn't get any better. Design also features a slight boss on the ouside edge of the outer diameter for registering the face of the tire and to provide a more realistic appearance. There is also a slight face to offset the wheel from the face of the ball bearing on the drive side. The Sigma Competition series shaves away all possible weight with lightening holes machined on the wheel flange. Price is for two wheel rims including set screws.

Outside Diameter: 20.5 mm Inside Diameter: 19.5 mm Rim Width: 8.0 mm Overall Width: 14.5 mm Axle Hole Diameter: 3.0 mm Bearing Boss Diameter: 4.0 mm Screw Boss Diameter: 8.0 mm Screw Threading: M3 socket set screws included