How should you clamp your carbon frame in a work stand
It is important to note manufacturers do NOT recommend clamping onto the frame
Most top tubes are not designed for clamping forces, while other top tubes are not round making it difficult to clamp safely. Also, when clamping the frame, it is possible to damage the paint, or dent / crush the frame tubing, especially if you have a carbon frame or lightweight alloy frame.
The frame tubing is much thinner, compared to the thicker tubing of a seat post, which is designed to support the weight and forces of the rider. All bicycles, including mountain bikes, should be clamped into your repair-stand either by the seat post or bike drop outs