I haven't started an actual build thread because I still need some stuff. Just got my triple trees from Twinside cycles in the mail today and now I want some tubes (39mm). My question is how do you decide how long your tubes need to be? Using rake and wheel size? Also, not to get too sciency but how do I decide the fork tube stiffness and such? Surely I won't need anyhting too crazy for a souped-up flathead 45 with mayyyybbbbbbeee 40 hp. I've sort of just used Sportster parts on this bike because the size and weight seem similar. What are your thoughts?