Originally Posted by
lisitsa
The interesting thing with my 7.2 which is a 25" size, the geometry is almost traditional. It seems that as the sizes get higher, Trek changes the geometry. I don't know why they do this.
Small frames usually have a slacker head angle to reduce toe-overlap, the larger frames steepen the head angle to stop the wheelbase becoming too long. There is more to it than this, but it's the main difference.