So I haven't ridden in about a week. Yesterday was absolutely beautiful so I decide I'm going to ride to work. I get dressed, go to the kitchen to retrieve my bike, and notice my front tire is completely flat. No air whatsoever. Bummer.

Today I take out the tube and grab my patch kit, pump a little air in the tube and listen for a telltale hiss... nothing. Not a single little pinprick. I run my fingers along the inside of the tire, nothing suspicious. Very peculiar.

Have any of you experienced this before? Now I can understand needing a little boost, I usually have to add 40-60 psi before each ride, but completely flat? It boggles the mind. I'd really like to know what caused it so I'm not caught after class with a flat. (I know I need to invest in a frame pump, just don't have the funds at the moment.)