Can anyone help me figure spoke lengths if I'm building wheels using Novatec A271SB and F372SB?
Hub specs and photos can be found in the 2011 catalog
There's some good pictures of the lacing I'd use here.
First, the paired holes require some adjustment to the "cross number" used in the various spoke length calculators. But how much? Spocalc.xls says to increase the cross numbers relative to a normal wheel, e.g. for a 20 hole wheel w/ 2x lacing use 2.29 cross. That makes sense if the two spokes on one flange "tab" do not cross (like the front wheel in the example pictures above) but not if they do (like the rear wheel). How do I calculate the cross number adjustments?
Second, the flange cutouts are offset from each other left-to-right. How does this affect spoke length?
Any guidance would be most welcome.