Welcome to the board Cannondale - if you get a chance, there's a thread under the open titled "getting to know you"....gives you a chance to learn more about us and to tell us something more about you!

Like Kiwi said: there is no such thing as a stupid question and you can ask pretty much anything here - someone will know the answer.

As for CO2 cartridges, it's all I carry on all my bikes and yes you can use them for any size/type tire.

You'll find most of us carry either CO2 cartridges or pumps, some of us carry both.