I have no rules I have to follow just wont the best et and most consistant hooking tire . The track I race on is known to be slick and inconsistant. Which would work better 2756015 pro or 2810515 pro bracket. Is there any measurements of the pro bracket on a 8 inch rim if not what would be a close estimate. I guess this question is for Jason. I run 2756015 pro at this time 60ft 1.371.