Last night when I was getting ready to do my 1-2hr ride in the park, I discovered a flat rear tire. I didn't have any spare tubes, so I tried to use a patch kit. Well I got the tire off, and the hole was big enough to fit my pinky through. Needless to say, no patch would hold it. I looked at the time, 8:30pm, local bike shop was closed. I drove to the nearest big box department store to see if they had any tubes. All they had was 26" or smaller. So basically I just accepted the 'epic fail' and had a few beers. Of course I ended up having to drive today, but I'll make sure to pick-up some inner tubes during lunch.