think of teh ribs on your front tires as like a shape of a paddle on your rear tire... and liek a paddle you want teh cup side facing to teh rear.. same concept with the rib.. you want the cup(or vertical) side to face outwards

 

Yes, make sure the flat side is facing outward. If they are turned inward then they will be constantly throwing sand on you and your engine. When you turn in sand the wieght transfer of the quad is to the outside wheels, so you want the "rib" to dig in and throw the sand AWAy from your machine.



Biggerisbetter.

 

Makes sense - thanks !