The tire runs so wide that it's about 8 inches wide if I actually go and measure the width of it. I don't understand it.
Your rim width is actually 8" total, but they are stamped as 7" because rim width is measured bead to bead. So if your tire measures 8" wide, then that means the sidewall is pretty much straight and is not ballooning outward.
If you ever want to go lower, you've got to make sacrafices =/
Truf, took me a while to learn this.