I'm building it for him. Lol And Pleb, I know what it is now. One set is for the radial side on the front wheel, one for the cross side And the back will have two different sizes because you have a disc hub and tha flanges are different sizes. I'm not sure which length goes to which though. Obviously the shortest will be for the radial but shouldn't the longest spokes go on the other side of the front wheel? Because it's a 20" rim instead of 19" so surely the spoke will have further to go?