Not got the rule book in front of me at the moment but i was one of the affected by the change in interpretation
Rules stated as i read them that the design is open, no limits, lower or upper nothing specific on frames,unlike the m/mps class that is very specific.
my bike is most definitely outside m or mps on many points, but my frame is mostly stock , so all of a sudden there is an area that fits nowhere
there was a lot of bikes affected both those picked up in the initiall tech inspection and even worse for all involved , rider and the tech guys to disallow a qualifying run
Personally i figure i can work with any rule book and run to whatever specs i am presented with, but was initially a little annoyed with such a change in attitude and no warning
lets work to get it better next time