For anyone who might have this issue.....I have been searching for tires for my road bike, which is a Rivendell with 26" wheels; it is a 50 cm and has the smaller wheels to avoid toe overlap. I have come to really like 25" tires because they help me to go faster! I had been using mtb slicks, but found recently that Continental makes them in the 26" wheel size, and they are really nice (and the brown sidewalls compliment my brown leather Brooks sadde).