I upgraded my Peugeot AO-8 a few years back to a fairly nice set of 700C wheels with clinchers.

I will be looking for replacement tires soon and wanted advice for the right size. I use the bike for casual riding but like to be efficient.

Currently running 700x25c. I feel like these are too narrow but they do run smoothly and fast. I just wonder if they are possibly too fragile for the "real road".

I spent some time researching my old books, magazines and the net, but have found few recommendations on what size works well for what type of riding. Do any of you have suggestions about what size works well for which types of riding?

Mark