When I designed and built my frame, I had no intentions of racing, so I kept the rake and trail conservative at 26 degrees and 2.75". Wheelbase is 48", about 7" longer than stock. Those numbers gave me great stability and confidence when going 60+mph, but when I brought it to a tight kart track, I was more pushing it around the track than riding. I was still able to be competitive and have fun, but its not what the bike likes. What are your intentions with the bike? Planning on a trellis, ladder style frame or something more simple with a large backbone? although a mono-shock may be a better, more modern way, I stuck with a twin shock so I didn't have to modify the subframe.