I'm not sure it'd be worth the effort to change from 7.50r16 to 235/85r16, they are almost the same size. Here's an old shot of my two (well, three), the Defender wearing 235/85r16 BFG KM2 Mud Terrains for comparison.
The 235s are a little wider, but diameter is the same.
255s are generally accepted as ok on 6.5" rims. For what you want, I would just run a single set of 255/85r16s all the time. Two sets of wheels with slightly different sized tyres is a waste, for all the time and effort it takes to switch them over you'll just leave one set on. Trust me. Maybe I'm just lazy
After doing some tire calculations
http://www.1010tires.com/Tools/Tire-...16/33x10-50R15
255/85R16 seem like a good size, now let's see what I can get with that size...
I wouldn't have a problem running 255/85-16 on 6" rims. They will be fine. I prefer a narrower rim as it gives you less chance or damaging the rim or losing a bead when aired down.
I have 285/75-16 (33") MTRs on one vehicle and 255/85-16 (33") Maxxis Bighorns on another. They both get used for everything: Mud/sand/road/long distance touring. Both are on 7" (modified Disco 1) rims, however the 255's could use a narrower rim.
IMHO it is better to buy one set of tyres rather than 2 sets that get old and hard and need to be replaced when half worn.
Really? I thought it would have worked the other way around? (in my head atleasr)
My idea was to get cheap all round tires and flash mudders, but if I have to replace them after little use and sitting around all year, then maybe not. How easily and fast do tires expire from sitting around?
I have never rolled a tyre off a bead. I usually run my tyres at 7 psi offroad. I have seen plenty of people roll the same width tyres off 8" rims.
Current recommendations are 6 year life for tyres. In NZ they will probably stay soft and supple for longer though due to cooler temperatures and less UV/ozone.
At the end of the day though it will probably cost you more to run 2 sets of tyres.
In the 255/85 size there are 2 main choices, BFG km2 muddies or Maxxis bighorn muddies, both go for around the 300-350 price, sometimes less.
I have the maxxis on my defender and they have been good, better than the old 235 /85 cooper st/bfg at combo the previous owner had.
The one thing to consider is the offset. I have a longer travel setup and the 255's would just rub on the rear spring mount top plate at full articulation on the factory alloys(+33mm). I have some wheel spacers to stop this(take it to zero), or you could just get the wheels at a further out offset, +20, 0 , -15 or -25.
Stay on the stock rubber size...
Bfg MT range is good and run on of the MAXXIS numbered range for about the same performance for a lot less buck.
By way of example
The maxxis 980 is a drop on replacement for the BFG AT as fat as performance goes.
Dave
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