You can. Otherwise they wouldn't be able to use them in competition. Can't remember the exact rule, but it is along the lines of the kit must be available to anyone.
That rule has the status of a "Request For Comment" at the moment, the UCI have mooted it but in terms of frames being "marketable" rather than actually being on sale to the public before being permitted in competition. Advanced Composites are a contract manufacturer for British Cycling, and BC owns the design rights on those bikes and will not be selling them unless they are forced to by a rule change. Team GB athletes aren't even allowed to take them home.
That rule has the status of a "Request For Comment" at the moment, the UCI have mooted it but in terms of frames being "marketable" rather than actually being on sale to the public before being permitted in competition. Advanced Composites are a contract manufacturer for British Cycling, and BC owns the design rights on those bikes and will not be selling them unless they are forced to by a rule change. Team GB athletes aren't even allowed to take them home.