Originally Posted by
coachboyd
Most triathletes now run 700 wheels because they roll better, smaller riders (usually under 5'3" will use 650 because it allows them to get into a more aero position as the handlebars don't have to sit up as high.
I used to do lots or tri's and then stopped until recently. The thing that surprised me geting back into the sport is no one, except very short people, use 650 wheels now.