Ducati also produced a very limited run (less than 20) of 748RS machines, which were intended as full racing machines and as such came with no road-going equipment (lights, odometer, mirrors). The engine internals and components were vastly different from any road-based Ducati, using a variety of light-weight, high-strength materials making them extremely expensive to purchase, run and maintain. The RS came with a 54 mm exhaust system and a slightly smaller size and gauge of Chromoly tubing was used on the frame to reduce weight even further.