I have been testing two Renthal Twinrings, one on a 450 "light adventure" dual-sport bike and one on a two-stroke woods bike. Both chainwheels have endured the extremes of mud bogs and bottomless sand, one with 30 hours and the other with 50 hours. The former shows no discernible wear and the latter shows a slight loss of tooth profile. I have not noticed any movement between the inner and outer rings, and nothing is discoloring or rusting. The Renthal Twinring does cost more than its all-aluminum counterpart, but this is money well spent, as the entire drivetrain will last longer.