Another quick update. I got into the shop today and managed to get the front tires replaced. For comparison purposes, the used-but-new-to-me snowshoes are on the left:
The driver's side tire was a b**** to mount, and the passenger side tire went flying when I tried to balance it (didn't have the right adapter, scared the lab assistant), and consequently I ran out of time to do the rears. I haven't had a chance to get the brakes looked at fully. I took a quick peek after finding the issue that I will talk about in a little bit. Anyways, it looks like I'm leaking a little bit at my rear passenger side caliper where the brake line meets the caliper. This was under a quick peek with a flashlight laying on the ground in the parking lot. In the middle of my online English class. Oops.
Also, I found something somewhat alarming when I got to the shop today. I found a bunch of black goo on my rims. No clue what it is, and as far as I know it wasn't there yesterday when I left to pick up the tires some hour and a half away. I didn't exactly look yesterday when I got back, but I don't think it was there. It's on 3 of my rims, although it's on the outsides of the spokes like someone splatter painted the rims, as well as coming from the deeper parts of the wheel. The only thing I could think of it being as far as fluids from my car would be oil, but I checked and my oil level is fine, as well as the color.

Here's the passenger side front, one of the wheels where it looks splattered:
I have no clue what it is, especially since I don't remember driving through any puddles, construction, etc. in the last couple days. It's really throwing me for a loop, and I don't know what to do besides check my fluid levels. Any suggestions? I can't smell anything right now cuz I have a cold, but I can have my roommate give it a shot when he gets back.