we mocked up a firebikes cha chi frame with a custom springer by Jakz....other specs: 100mm rigida, shimano 3spd....chain tensioner....custom shifter selfmade with a piston....american legend custom bar....nirve saddle and grips....felt thick brick in the rear and schwalbe fat frank in front...drum break.....firebikes billet chainwheel "mayday".......testride was in frankfurt and the ride is .... great