Whee. So, I got to the Y and Jeff noticed I had a flat tire. Completely, totally, horribly flat. Which is funny, because I didn't notice any difference in handling on the way to the Y.
Jeff put the spare on for me (I know the process of changing a tire, but I physically don't have the strength to crack the nuts; yes, I'm a wimp). Luckily, it's a full size spare, but still, tire replacement is a new priority this week. Whee.