This rule proposal was proprosed via email and given permission to post on the forum for the members discussion: Rulebook change - Chapter 7, battle of the twins / middleweight twins class structure section 7.8 be amended as follows: I. Up to 650cc four stroke liquid cooled twins II. Up to 1000cc four stroke air cooled, two valve twins III. All Supersport rules apply. Proposed rule change for Battle of the Twins/Middleweight twins class. As we have more bikes that are closer to Supersport SV650's then ones with modified superbike builds the racers with 650cc Supersport build bikes should have good class that would allow all of them to have an equal chance to podium finishes. Big bore bike, superbike build bikes should be in Middleweight Superbike and perhaps F118 and F115 classes.