I installed new tires on my commuter over the weekend and did my first commute on them yesterday. The bike in was uneventful. After work I got the bike all loaded up with my Garmin, panniers, etc and was about to push off and go when I realized my back tire was flat. So, took everything back off the bike so I could turn it over, removed the wheel, and replaced the tube (looks like I probably pinched it when I was removing the old tire). First time using CO2 with these tires so I was afraid to overinflate them (max ~80psi) and ended up stopping too early and riding home with an underinflated tire...into a strongish headwind. It was a slow ride home. I'm pretty amazed I made it in without going flat.