I confess that my daily summer commuter has a 700c tire with a presta valve. Rear tire is a 27 inch Shraeder. Reason is that I just built up the front wheel and am test riding it. Problem is, I liked it so much, I didn't take it off. Currently, I seem to have more wheels than bikes... not a bad situation...

One thing I love about my old Fuji commuter's down tube friction shifter is that I can put any wheel on the back, from a 126mm 5 speed to a 130mm 9 speed and it shifts perfectly.

Great for checking wheel builds.