Hi Dave,
What GB is talking about is attaching (tie-wraps, tape) a pencil at a right angle to the fork so the point of the pencil is very close to the rim's outer edge. When you spin the wheel slowly, you will be able to see if the rim is true by how much the gap between the pencil and the rim varies.
I cannot answer what would be an acceptable level of runout.
btw, while you have the front end off the ground, check for balance. Spin the tire and let it settle. Mark the lowest spot and spin it again. If it comes to rest in the same spot, that area is heavy and the wheel/tire is out of balance.
Quote:
The "sweep" of the stock cables are not aesthetically pleasing this tight
Too tight of an arc could cause premature cable failure
