After spending ages on the above site I have givenup as I just can’t seem to get an answer. I enter easily, rim, hub, number of spokes and cross but when clicking calculate nowt happens. I don’t have the options about rims measurememnts but they seem to be provided. There is one empty box level with the cross box that isn’t lablled. The lettering near it is ri . What is going wrong or can some one provide an easier caluclation site. I only want to know what length spokes to use with Mavic GP4 rims, a Shimano mountain bike hub, the measurements are all the same, with 36 spokes and 3 cross. Anyone?

The empty box is for the cross pattern on the right(they can be built with differing patterns),3 is the norm for both sides.

Yeah I fill that one in. Oh do you mean the cross each side. Is that whats missing. Must admit I assumed the same cross on both side but if thesystem wants boths sides I didn’t complete the form. Lets try