http://www.amazon.com/Continental-Ul...980822&sr=1-17

This is the one I was looking at, I vaguely remember a review or something about someone buying something for their bike and thinking they were sold individually but found they were sold in a pair. I really just don't want to buy two and end up with an extra set. I think now that tires are sold individually, though.

And out of curiosity would going from 28 to 23 cm make a significant difference in speed?