Great weather, low 60's. We took a new route in which let my wife's muscles warmup before any good hills. I was in route to my doctor's office and had the rear tube blowout while I was doing about 20.

Fortunately, the doctor and the LBS were within easy walking distance. Had to replace the rear tube and tire; the sidewall had worn off from the wire rim, after only 800 miles! The LBS (
Bike South near Emory Univ. in Atlanta) let me change the tire inside the store and offered the use of their air pump--nice!