I'll start off. I have been commuting part way since May more days than not. By part way I mean I drive the first part because the roads near my house are not safe enough for me, at least coming home. Today I had my first flat while commuting. Lesson one, yesterday when I was worried about my rear tube I just decided to put some air it in and ride this morning. It blew with a loud pop. Lesson two, check your equipment. My small pump had been used on the side of the road a couple of weekends ago one my road bike. In the process of switching to Presta valve mode for that bike I evidently lost the little part needed to open the Schrader valve I needed this morning. That's ok I think. I'll just use the CO2 cartridges to fill it up. But either my valve for the cartridges either only does Presta valves or I was not carrying the converter needed. Usually I am much better prepared than this. Today I got to walk back to the car and drive to work. Plus I will miss riding home on the warmest day this week. I am thinking of trying to pick up a Topeak Road Morph G Bike Pump with Gauge on the way home today.