Not directly relevant to the original question, but I recently put Nexen 165/80 r15 on my BJ8 and am very happy with them. They were replacing 175/80 r15 tires, which are no longer made (as far as I know). The Nexen tires are very affordable and have a nice narrow profile. Maybe it is the rubber compound or maybe it is the slight difference in width, but I feel like steering the car at low speed is genuinely easier on the new tires. I measured the diameter of the old tires to the shoulder between the sidewall and tread, and it was 26" (which matches those online calculators). On the new Nexen's, it is 25.5 (which also very closely matches those online calculators). So the axle is nominally 0.25" closer to the ground then before, but I think it is a little more than that because of increased tire deformation of the narrower tire. And the speedometer is going to be off a little bit more now, unfortunately.
Regarding pricing, I ordered 5 tires for $70 each delivered via ebay. I was able to get them mounted and balanced for $65 total in southern CA. So for about $400, I have 5 tires I completely trust, versus the 12 year old prior tires which always had me a bit nervous on the freeway.
For anyone who hasn't tried it, driving on narrow tires can be very fun, which is the main reason we own these cars.