I am a casseroll owner. I feel as it the bike would benefit form faster thinner tires a 25 tire would make a difference. The stock tires are wide and also have a flatter profile than other tires.
Uploaded with
ImageShack.us
I tried these on my hybrid which had 32's on before and it felt much more responsive.
[IMG=http://img404.imageshack.us/img404/6889/photo20gs.jpg][/IMG]
Uploaded with
ImageShack.us