I don't have any experience with them but Costco is having their
yearly sale on Bridgestone and Michelin tires.  Go to www.costco.com
and look up 225-70-15 and similar sizes and I think there are some
Bridgestones for around $85 each.  If you buy 4 tires you get $15 off
each tire.  They also have the Michelin LTX but they are about $110
each.
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia?  It is to prevent the
establishment of a standing army, the bane of liberty.  . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins."  -- Debate, U.S.  House
of Representatives, August 17, 1789  

I bought my Michelin Cross Terrains from Costco.  I did'nt care about
the price because Ford paid for them because of the recall.  No one
else had them in the NYC area. Costco had them in in 3 days after the
order.  I think I paid $126 each including tax, installation and
balancing.  Best tires i've ever had.

The best tires I've have been the Goodyears they used to install but my
local tire center doesn't warrantee them.  I've had ok experiences with the
Michelins.  Tried Pirelli Scorpions after the tire swap event and absolutely
hated them.  Currently I'm running Toyos and am very happy with them.

Michelin Cross Terrain SUV are fabulous on the Explorer but won't come
cheap.  Low noise, good wet and dry traction and surprisingly good in the
snow.  I tossed the old BFG donuts right in the garbage where they belong.

Steve R

I'll second the vote on the LTX's.  I put 85,000 on mine before they even
started to show wear.  I replaced them with BFG Long Trail T/A.  They're
alright, but I miss the Michelins.  Cost was the only factor, and I wish I'd
spent the extra $100.  Someone mentioned Pirelli Scorpions, but Tire Rack
says they're not approved or recommended for the Explorer so you might want
to stay away from them.
If you think your 91 has another 70-80K left in it, spring for the
Michelins.  You won't be sorry.

I also replaced the Firestones on my 2001 Sport Trac with Michelin Cross
Terrains. I now have about 22K on them. Just completed a 1200 mile trip, and
the vehicle and tire performed flawlessly. Drove from Fort Worth Texas to El
Paso, at 70 to 80 MPH. The tires were balance and rotated before the trip.
Thirty years ago, when statistics on tire ratings and comparisons were
available, Michelin has the lowest number of defects, 2% compared to the
closest competitor at that time, Goodyear, which had 10% defects. Every
other tire maker was down hill from there. When I am driving at highway
speeds I want safe tires on my car. Michelins still fit the bill.
Ron