The existing roll bar in the S1 suffered in that the supporting struts in the engine bay were not sufficiently strong and therefore required an additional petit-bar in order to meet safety requirements. The S2 used a sectioned hoop in two different diameters, which is unacceptable for racing and further the rear struts into the engine bay are too weak.
All Hot-Lap cages for the Elise and Exige are designed for added strength and improved safety. This has come about as a result of developing a cage specifically to meet the very stringent and demanding safety requirements for use in rallying.
The 4-Point Cage now employs a continuous hoop and the conventional A frame is replaced with a left and right diagonal forming a cross with the harness bar passes through the cross in the same plane. The strengthened rear struts are welded to the main hoop for strength and pass through into the engine bay. The fitting of the gusseted struts in the engine bay uses the existing screw fitting through a vertical tube into the chassis and is designed to surround the shock mounting points for added structural strength. This exceeds the MSA guidlines for 'Race Car' roll cages.