I have two sets of Matrix ISO11's here. My son rides one set . They are the toughest rim to mount tires on, tougher than any other rim in my experience. I would rather glue a tubular. This is a rim where you take three tire irons with you to go ride as there is a good chance you might bust one, that's if you can get it between the rim tape and bead to lift it over the edge of the rim. They are on my upgrade list for sure!.