Just a bonus piece of info ... you should fill your tires often. DH does it every time he rides. I'm still a tire pumping moron who can't get the stupid thing to work, so he does it for me for now! (I'm determined to figure it out myself, though!) He says keeping your tires filled helps reduce flats. The less air you have, the more likely something will wiggle in there and cause a leak. He used to get flats a lot more often before he started filling his tires before each ride. Every tire has a different requirement as to how much air it should have. Hopefully you know what yours is.