@ Alltornup, frenchy is right i will not disqualify you for having 30's instead of 31's. as long as your rig is capable and meets all the other requirements i see no reason not to let you join us. these open runs are about gaining experience and finding out if this sport is right for you.
now don't take this as a free tickit, the requirements are there for peoples safety and to make sure your rig is up to the challenge of the trails that the leader has chosen. and some of the requirements can not be bent in any way. tire size is one that can be bent a bit to allow newer wheelers the chance to see what a real off road trail is like and if they want to continue in this sport.
Dana