I carry both a CO2 inflator for when I need to fix a flat and just get home and a Lezyne pump with the pen gauge for when I want to adjust the tire pressure. If you read enough of these threads you will find people who say their pump was always broken when they needed it most and others who say their CO2 was broken when they needed it most. Each group now uses the other kind, of course. Another reason I carry both is that some day I will be able to be the first to say that I carried both and both were broken when I needed them most! That is why I now run solid rubber tires....

Ken