With the increase in tire sizes from 23 to 28, the newer rim sizes are also changing to accommodate it all. Pro riders like the one's in the Classics are asked by the bike manufacturers the two things: speed and comfort. So it does matter and eventually filters down to the mass market.
The older Shimano brake calipers like the 6600 & 6700 may not open up wide enough to accommodate the newer rim widths.
Last edited by Garfield Cat; 03-14-19 at 07:04 AM.