I have laced up a few wheels, but never with a 4 cross pattern. When I was talking to the LBS the mechanic told me that you need multiple spoke lengths to do this pattern. I understand that due to dish, you may need different spoke lengths for the left and right side of the rear wheel. The mechanic however told me that I will also need different spoke lengths with respect to one side of the wheel and that he didn't know why or how to figure out in advance what lengths. I can't find in any of my books or online a mention of different spoke lengths neccesary for a four cross pattern. Has anyone heard of needing multiple spoke lengths (with respect to one side of the wheel) for the four cross pattern? If so, how I can figure out the other lengths.

Thanks