What a great route with a ton of climbing, cold night air in Sonoita, great lunch provided in Tombstone by Mike. Went out with the fast group of 400/600k riders for the first 20 miles then rode solo the rest of the way. Good weather with a bit of headwind, but not bad, especially for this area. Made it to almost to Sierra Vista before turning on lights! Had strawberry pie at McDonalds and it was surprisingly good. I was dressed plenty warm and never used my green woolie. Mike had cup o noodles at Sonoita Yum. Then on descent from Sonoita I noticed it seemed harder and harder to keep speed up. Turns out with 1.5 mile left before crossing I-10 I noticed my rear tire was almost flat. Guessed that a light could be found at the freeway, so rode up there slowly. No light. So stopped in an wide area of next to road next to turn to Old Sonoita Rd and shined my headlights up against a rack of aluminum mailboxes that reflected enough light to change the tire. That worked. The ride through town on the bike trail was brand new to me. It was colder than the other part of the city ride, but I liked the no traffic and it was easy to find my way.