I decided to do a different ride than normal tonight and rode over to RB's Cyclery for some hills. It was a small crowd, only 7 of us (which turned into 6 after one guy broke a spoke after 3 miles), and we were ready to climb. Here's the route:
Someone else flatted about 100 meters from the shop, but otherwise we had no incidents. Though 2 out of 7 bikes having problems seems like a high ratio to me.
Stats: 1:20:00, 20.34 miles, 15.3 avg (49.1 max—maybe a new record for me), 144 HR (187 max)