Build on a Solid Foundation. Diablo frames are produced in house based on designs by Master Builder and Television celebrity Brad Ruel. Top quality beefy thick walled pipe made from American steel and TIG Welded by hand, in the USA. Builders from around the world use these very frames for the foundation of their top builds. Most of our frames are now available standard with Twin Cam, VRSC Vrod as well as Sportster and Buell set ups. This gives you the peace of mind knowing your build is on a solid platform, no matter what power train you are using.