Midlife,
I have been mulling this same decision over for weeks and done as much research as I know how and have come to a few conclusions -
In the U.S., the two most common tires that will fit an 80 with no lift are 265/75's and 285/75's. 255's are cool, but not easy to find in case you need to buy a replacement somewhere outside a major city.
Because 255's are an oddball size, there are a lot fewer choices in a truly "all-purpose" tire that is TOUGH, will handle well on pavement, and will not leave you stranded in the boonies. The BFG M/T's look GREAT as an "expedition" tire, but they probably generally suck on pavement, especially if wet or icy/snowy. Toyo M-55's are probably the best thing out there, but you're gonna pay for 'em. Everything else in the 255/85 size is either too soft to resist punctures when driving through greasewood etc, has a reputation for really bad chunking/chipping in rocks, has a reputation of being very hard to balance, wears out too fast, or is more of a commercial truck tire and not really meant for off-pavement driving at all.
I really WISH there was a "perfect" 255 for "expedition" type use because that is the best description of the type of driving I'll do with them, but the
best tires for this type of use are not available in that size... except MAYBE the Toyo M-55, but I'm too much of a cheapskate to pay $1500 for a set of tires. The
best tires for me would probably be Toyo Open Country M/T's in 265/75/16... assuming I never need or want to buy another one while out in the hinterlands someplace. The second best (much as I hate to admit it) would be BF Goodrich All Terrain T/A KO's in the same size. Next best (next easiest to find) would be either of the above in 285/75 R16.
Just so you know my frame of reference, I plan to drive roughly half my mileage on pavement (75% of which is 70 mph hwy), the other half will be roughly 90% rough dirt/rock roads and 10% through the brush and rocks with nothing remotely resembling a road. Short of a hard-core rock-climber, I can't imagine a much rouogher life for a tire. In my area, about half the ranchers etc drive whatever's cheap so they can just throw them away when they get torn up, and the other half drive BFG's.
If anybody reading this thinks I'm wrong about any of the above, PLEASE LET ME KNOW. I'd really LIKE to find out I'm wrong, so I could pick a "perfect" 255 simply because I think the truck will look better with that size... I can't imagine the extra 0.5" of ground clearance will make any practical difference.
After saying all that, I still might very well end up with a set of 255 BFG muds.
