Although Thule calls this a Carbon Frame Adaptor, we think it would make sense to use it on any frame material you don't want to be crushed or scratched. The adapter works by distributing pressure over a larger surface, instead of concentrating it to a small area, to minimize the risk of frame damage. It's easily adjustable, fits over any tube shape, and the soft TPE lining avoids scratching your frame. Thule mandates that it's only to be used with Thule bike racks with a torque limiter knob such as the ProRide and EasyFold.