The Yamaha Deltabox frame is a patented motorcycle chassis produced by Yamaha Motor Company of Iwata, Shizuoka, Japan. The first road version of the Deltabox Frame, for general public appeared in 1987 on the Yamaha FZR1000. It then began to be featured on more and more of Yamaha’s sport bikes from the late 1980’s through to today.
Deltabox Frame Offers Four Times The Rigidity
In 1982, the Yamaha YZR500 OW61 racing motorcycle introduced a number of initiatives: the first V4 engine in a 500cc Grand Prix motorcycle; a new frame structure, developed by Spanish engineer Antonio Cobas, that was the basis for the Deltabox frame. Used by Maserati in the Tipo 61 “Birdcage”, the Deltabox Frame is based on the theory that a triangle (delta), is more rigid than a square. By using a diagonal from the steering head down to the swinging arm pivot, the frame is triangular versus a rectangular box like a backbone frame. The design allows the engine to hang from the frame over being cradled, and hence be positioned as low in the chassis as possible.
By using controlled Flow die-casting, a hi-tech process that introduces alloy under high pressure into a vacuum held die. This limits air bubbles and allows the casting to be made extremely thin where strength is not required and thicker at the stress points. The end result is a component that is lighter, stronger and consistently exact when compared to any other method of casting or welding. The Deltabox frame using this process offers up to four times the rigidity (less flex) than other designs.
It now appears on many Yamaha products, including all snow mobiles.
There was a DeltaBox II and in 2002, Yamaha released the newly developed “Deltabox III” frame which, with its hydro formed construction, dramatically reduced the total number of frame welds. These changes improved the frame’s rigidity by 30%!