1. The back springs are under the axle and outside the chassis frame . 2. It has a tubular chassis frame with aluminium alloy body panels. 3. It also had a strengthened chassis frame , enlarged fuel tank and other improvements. 4. The chassis frame was quite new and now also contained a cruciform shape. 5. The Mercury had a self-supporting body that eliminated the need for a chassis frame . 6. It was directly attached to the Pennine RU chassis frame , saving further cost and weight. 7. For engineering, the rear kickup on the chassis frame was eliminated by the adoption of a'banjo'frame. 8. Other improvements for those pre-WWII cars included : variable-ratio steering and increased rigidity of chassis frames . 9. Its chassis frame comprised four longitudinal tubes with hoops at the cowl and behind the driver. 10. The chassis frame has five cross members and the frame is deep and as rigid as possible.
