Just wanting to pick up a set of tires for the road bike, changing from
28 to 23 cm, but don't know if the tires on Amazon are sold in pairs or singularly.


Looking at these:
http://www.amazon.com/gp/aw/d.html?p...2SR3O5G&sr=1-5

and has anyone went from 28 to 23 and noticed a difference in speed?

Thanks, for the help!