A minimum of on diagonal bar across the top of the roll cage is recommended. Back to Top 3. The fourth side must be vertical. No holes may be cut in frame rails to lighten. Steel frame rails only.
Rear frame rails.
All measurements shall be taken from outside of frame rails. These measurements shall be taken at both top and bottom of the frame at its longest length. Clips, subframes, etc. will be considered part of frame. All kick up material must be same specs as roll cage or frame material. Modified type front spindles with steel bearing shafts recommended.