I have stock rims on my car right now...

14 rims.
185/60/R14's

BUT the front tires look larger in diameter than the rear tires...

Any ideas why this would be? (I've look all over the tires for differences in specs but can't find a reason. Even my friend said they look weird.)

 

Are all of the tires the same brand and model?

 

Actually no... I think the front two are different than the back...

All I can remember right now is that the back two are Kumho.

I thought that didn't matter though.... ???

 

The sizes of tires from different manufacturers, and even from different models from the same manufacturer, can vary even when they're labeled as the same size, although not usually by a whole lot. They can also sit differently (i.e. some tires have stiffer sidewalls than others, etc).

Check the size shown on the sidewall on the tires to make sure they're really all the same size. Also check the air pressure to make sure it's what you want it to be, that one isn't flat, etc. If all of that checks out, then don't worry about it.