A quick guide to what each tube does in making the roll cage as strong and safe as possible.
A post gusset - Improves strength as the cage A pillar can be welded to the screen pillar (not applicable to all models).
Dash bar - Improves rigidity and side impact strength.
Door X bars - Upgrades single door bar for significantly improved side impact protection; improves door aperture stiffness.
Front cross - Improves lateral stiffness of strut tops and bulkhead.
Hoop to A pillar tube - Designed to improve support for A pillars at roof level.
Hoop cross - X section now required by the latest regulations to improve roll over protection.
Lower rear stay - Triangulates loads from the rear struts so improving rigidity.
Mid rear stay - Adds further stiffness to rear section; improves side impact strength.
Rear strut brace - Improved bodyshell stiffness enhances handling by feeding suspension loads into the base of the roll cage; can be used or seat harness mounting in some models.
Rear X - Stronger than the simple single diagonal tube. Gives additional strength to rear damper mounts.
Roof cross or roof ‘V’ - Increases roll cage rigidity and safety in the event of a roll over; essential in later model rally cars.
Screen pillar support - Important for latest generation saloons with a steeply raked windscreen to provide additional support to the top of the A pillar/roof section. Now required by the latest FIA regulations.
Seat harness tubes - Needed for wrap-over seat belts. Safety improved with shorter belt length and better belt angle.
Single roof diagonal - Lighter than a full roof cross but provides less protection – acceptable for race cars.
Triangulation tubes to front struts - Allows the front suspension loads to be fed into the whole cage structure; provides protection for occupant’s feet. It also improves side impact protection and increases the load capacity of the ‘A’ pillars/lateral hoops.
Tunnel brace - Improves side impact protection and supports the main hoop in the event of a roll over.
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