If you need recommendations for tires, the best place to find such information is online. My LBS was raving about a particular bicycle when I was shopping for one; well when I went online and surfed around it became apparent that the bike was a bad choice. So I bought another bike... When it comes to size though; I just buy my stuff online... You have 3-4 choices, small, medium, large, or XL; when you find a product you like call up / visit the companies website to figure out the recommended sizing; ie my under armor tights are XL, though all my other clothes are of the size large.