Originally Posted by Monti

How does this picture determine your thought process?

The black line represents a low spot and from the first picture a place where the foam stuck. This would mean/assume your tire truer is square to the rim you are cutting.

Also note yokomo rims are not legal according to the 38mm max diameter rule. They are actually molded with some draft (most wheels are) where the front edge is 38.1? mm and the in side is 37.?? I doubt anyone would check this at a race and is hard to prove since once you put on a truer to cut off the foam you would cut the outer lip down too. A new wheel is the best way to see it.

The reason they are doing this is it allows for a smaller percentage of foam on the outer side wall.

Monti