I have a set of dune trakker (smooth with a thin ridge down the middle). My friends are mounted with the ridge curved out and mine are mounted curved in. What's right and how does it work?

 

on your trackers, one side is beveled and the other is straight up and down. you want the straight edge towards the outside. this makes it grab better in the sand. If you have the beveled edge out, the tire will slide more. I run them myself and really like them. they turn on a dime and really make skating on the sand fun. hope this helps.