For the scrambles in MO/KS, I run 13/50 combo. It works real good for anything they can throw at you. You will notice more shifting, but climbling techincal sections are much easier. Also, if you know you are going somewhere that higher speeds are capable it is a 5minute swap to put the stock counter shaft sprocket back on. I go back and forth between the 2 diff sizes. Motoxing with the lower gearing really has you shifting but you can run more outdoor style courses in 3rd and up.