Neat idea, but treating and sealing the frame must be a right ballache. Also getting enough pressure in there to be worth it.
Now that I think about it I wonder how safe it is riding around on a frame pressurised to 150 bar/2000 psi. If a big rock dings it it mjght blow up. That's a lot of pressure.
Edit: maybe you could fill it with helium for the climbs
@frankenbike started
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Neat idea, but treating and sealing the frame must be a right ballache. Also getting enough pressure in there to be worth it.