After completing a few tours this summer with my new '07 Trek 520, I'm giving thought to changing the tires to something with a better profile. Many here have recommended the Schwalbe Marathon Plus tire, but I'd like to better understand tire sizing before buying anything.
I understand it's possible to replace the existing 700x32C Bontrangers with 700x32C, 700x35C, or even 700x38C(??) Schwalbes. That's fine and all, but is there an optimal choice, or does it come down to preference? If it is preference, how will the different sizes affect my ride?
Thanks in advance! chris