RHS, and extend from firewall to a maximum of 100mm behind rear rollcage hoop.
(f) (g) (h) (i) (j)
Rear roll cage hoop bar down tubes to be no more than 200mm behind the drivers seat. Minimum distance from centre of driver's seat to outside of rollcage to be 355mm measured at shoulder height. The roll cage must be braced by a front horizontal cross member, attached to front rollcage on each side at dash area. The rollcage must be secured by both a diagonal cross brace and a horizontal cross member travelling behind seat and attached to rollcage on both sides. A one piece steel hip-plate of 4mm minimum and 6mm maximum thickness and 381mm minimum height must be welded on each side of car to the front and rear roll bars, upper and lower side bars, to protect hips and feet. No holes permitted in plate. Driver's hip-plate may be curved around the rear of rollcage behind driver's seat. Only to be welded to rollcage. One additional horizontal side bar is permitted, welded in a mid position between the upper and lower side bar mentioned in T13-1-9(i). Three spaced vertical bars may replace the additional horizontal side bar on the driver's hip plate only. These vertical bars must be welded and fit between the upper and lower hip plate sidebars. A driver's footplate is permitted. The driver's footplate (if fitted) must be 4 mm minimum thickness, must be fully welded on three sides to three of the four following, but must not protrude through the firewall: 1 the front rollcage down tube 2 the T13-1-12(i) hoop brace 3 a footplate front brace from the same T13-1-12(i) brace to the floor plate, 4 the T13-1-11 floor plate.
2010 ELECTRONIC RULEBOOK