Well the big question "Did my Rubi rails rub?" was one of the first questions we answered during my 301 class. Kyle took me out on trail 38C which is a very off camber trail. I was flexing to the max on this trail and could hear the rails rubbing on my tires.
Listen to the Rubi Rails Squeak - Click Here
Generally though.. for the most part, they did not rub on the trails I would take most often. But I still think I will cut them because aesthetically they just have always looked off to me. Hopefully, the guys at my place work can help with the right cutting tools.