Originally Posted by NE1
Assuming you mean going up to >27m radius for GS, etc.
Higher, earlier lines and changes in course setting, I suspect, for starters.
...sidecut is only one factor. The FIS, in its infinite wisdom, made the rules >25 for the 2006-2007 season, then changed to >27 last season. There's a learning curve going from something like a 19 meter sidecut ski to a 25 meter sidecut ski, but once you get the differences wired, you can still take a pretty tight line. As for the difference between 25 and 27, it's miniscule to start with, and what the manufacturers did was tweak the other parameters (flex, and so forth) so that the transition from 25 to 27 isn't, well, much of transition...which is the way they wanted it for their athletes.
I think the original question got into the new regs for speed events. Even before the new regs, speed skis were heading in the direction of shorter/wider/more sidecut/different flex pattern. For example, a 204 Atomic Super G from the 2002 era isn't even vaguely like a 2008 Atomic Super G in a 205 length. Today's skis are better. They hook up easier, make an arc like a big GS turn, if you want it, and are just as stable, and, because bases get faster all the time, glide even better...