Wow. Just wow. You are a philosopher.
This is an incredible piece of work, and it definitely deserves the category of dark humor. The art is, first of all, very cartoony and is quite adorable, giving a very misleading first impression. The end scene was quite a turn. From the music and the animation, I thought it would end with a happy note. I even thought that the tire turning into a swing was a joke. Then I realized what it was supposed to mean.
I think the voice acting was a bit off, especially with the other tires. It seemed like there was a slight pause when someone finished talking. Only after this pause did someone else start speaking. Still, this is a great little short film, and should deserve all my stars. That is, if I weren't so strict. ;)