I have 13-51 it helped some. but im still haveing to grab 2nd on our motocross tracks. im thinking about bumping up it just cost to much to guess. is anyone running anything larger on there local motocross tracks? id like to be able to have good pull in inside ruts in 3rd. and then click 4th it helps minimize my 2-3-4 im doing now. and bumping neutral so often.