The favorite Spitfire frame design is now available for 57-99 Sportster. It features a 30 degree raked neck with internal steering stops, Precision machined components, and a continuous backbone for added strength. The 18" backbone height allows removal of the rear rocker box, and head for easy service. Also available in 33 & 36 degree rakes, and +2 & +4 stretch. The stock version of this frame is what we used for the "Jolie Rouge" bike. - See more at: http://www.spitfiremotorcycles.com/products-page/spitfire-motorcycle-parts/spitfire-bobber-frame/#sthash.lCgLgW1S.dpuf