3. APPLICATION A safety cage structure complying with Schedule J is required as follows:
3.3 Off Road Events: (a) Each Extreme 2WD1, Performance 2WD, Production 4WD and Extreme 4WD1 vehicle in an Off Road event.
Note 1: These vehicles may alternatively comply with the prescriptions of GR9 of Off Road Vehicles General Requirements.
(b) Each Pro, Prolite, Super 1650, Sportsman and Clubman class vehicle shall comply with the prescriptions of GR9 of Off Road Vehicles General Requirements.
and GR9 - Article 6, materials, states
Main hoop 38mm x 2.5mm Minimum 44mm OD recommended
So does that mean 38.1 is still going to be OK for a prolite buggy ?
Here is another case of having smart people in each class that can help with understanding whats required from the rules. Kev try to get in contact with Morrie Willims he is the cams /orcom tech guy that is supposed to know ? If you click on the Trick parts logo on the main offroad site that is his contact details