When making the red or yellow stripe on the wheels, I do this. If the wheel does not come in white, paint it flat white. When the white paint is dry, paint the wheel flat black. When the black dries (the paint really has to be dry before doing the next step), hold an xacto knife at a very shallow angle to the wheel. You want the knife almost flat against the wheel. Then drag the knife around the wheel slowly in about 1/8th inch lengths at a time until the white paint shows through. When there is a white stripe around the wheel, use a red or yellow Sharpie and color the white stripe the appropriate color. Apply a semi gloss clear coat and the wheel is done. Below are a couple of examples.