I saw Cman bought a bike that had the lines drawn around the edges of the rims and it was done with a regular marker. My wife came home from walleyworld with some paint markers tonight that would be good for that . the cost a couple bucks and come in differant colors . Called Elmers Painters. they are four differant widths and you could build a holder and run a line around the rims in a trueing stand. Ill have to try it and see how they work.