EFI SR400 /SR500
Design is reduced to its essential elements: the bare necessities such as the two large wheels, a motor and a bar to hold on to.
The combo seat/tank is hydroformed from 2 titanium sheets welded together to act as a beam girder for the frame. It has perimeter disk brakes front and rear and a hard tail frame. The carbon girder fork is inspired from a VTT Fournales fork more commonly found on mountain bikes. The underslung exhaust is hydroformed and has a large volume for efficiency.
text from Paul Crowe "The knee slider"