Larger end caps .... interesting.

Good article about the move to larger end caps on hubs these days.   The article features Roval wheels but they're not the only ones doing it.  Fisher also does this with their super sweet new road bikes to make them the stiffest bikes in the Trek family.

http://twentynineinches.com/2010/02/24/specialized-29ers-roval-wheels-tech-and-interview/