First commute in a couple of weeks. Was on vacation last week and busy schedule the week before vacation precluded riding. Beautiful morning, slightly marred by a flat coming in. Just changed out the old tube last night (broken presta stem), and brand new tube went flat about halfway in. Couldn't identify the issue, so I changed it out for the spare I had in the saddle bag. Kept the faulty tube and will check for leaks later when I get home. The tube change put me back about 15 min on the commute, and I would give high marks to my CO2 pump as it inflated the new tire in about 5 seconds. All in all, a little more eventful commute than I would have wanted, but good to be riding again nonetheless.