Hey there. I'm touring in Europe this summer and wondering which tire sizes will be the best for my bike. But here's the hitch...I have a road bike, a Trek 2300. As a result, what size will carry the load (mainly on the rear) the best while still producing a comfortable, yet fast ride? Also, I'm looking at getting either the Conti Top Contacts or Schwalbe Supremes or Pluses. Any suggestions? Thanks for your advice.
PS. Here's a picture of my bike (in non-touring form)