The HED C2 Rim is 23mm wide.  This is wider then the usual 19mm rim.

Most serious recreational and racing cyclists get there cues from the European Peleton.  Sometimes it takes a couple years, but eventually everything trickles down.

The use of wider rims didn’t just show up last year on the Protour is showed off.  Tony Martin used a Jet 9 front clincher and Jet FR Disc clincher to win the elite time trial world championship.  In the final time trial of the Tour de France, Tony used a Jet 6 front clincher and a Jet Disc.

Martin also chose the stallion build that HED offers.  This makes the wheel a bit heavier but it improves stiffness.

Steve Hed believes the aerodynamics of a Jet 6 or 9 with a 22/23mm clincher tire are some of the best in the business.

It looks like the world time trial champ agrees.