Tyres 285/75R16 or 33/12.5R15

the 16inch rims have a larger load rating if thats an issue.

IMHO either will be easy to get, it all depends on what brand you select more than size.. if you want some exotic tire, you will suffer. 285 maybe a little easier than a 33.

if you want a BFG AT etc you will be fine.

No comparrision with construction. 15 inch tyres are much lighter construction but do cost less. Something like 4 ply tread face and 2 ply sidewall vs 3 ply sidewall and 7 ply tread face depending on brand

in regard to your tyre selection question, id recommend you look at the various tyre stats because a 285/75x16 has a different overall diameter when comparing BFG's and Coopers. I looked into this recently and found that the 285 in the Cooper has an overall diameter equivalent to 32.5" whereas the 285 in BFG has an overall diameter of 33" exactly.

Might make a difference if trying to adjust your speedo to get it correct.

Max.

Richard

I have been watching this thread to see the types of response because I also am about to change my tyres over from the 31/10.5R15 to Bridgestone 285/75R16.

Last year I went with my son and and a friend for a trip in WA from Twilight cove, Baxter cliffs, Israelite to Esperance.

My sons car Tojo 100 series had Bridgestone 285/75R16 and mine and the other Tojo was shod with the 31/10.5R15.

Visually the 285 looks massive in diameter compared to the smaller tyre and when we measured with a tape there was a substantial difference tho the figures now escape me. But it was on the beach where the difference became quite marked. The 285's simply doddled along the beach with not an effort from the tojo whilst the two shod with 31's were doing it tough with heaps of revs and the amount of "sink in the sand" when the vehicles came to rest was quite pronounced.
When we came to a seaweed stretch this became even more pronounced with the 285 shod vehicle having little trouble but the smaller wheels causing a terrible stench like burnt rubber or clutch.

Still your original question remains I suppose, though because ieven if the overall diameters are the same be it small or large rim, it shouldn't theoretically matter diddly squat what the metal diameter of the wheel is.

Needless to say I'm going the bigger rim and 285 route because at least it will make all tyres inter-changeable between the vehicles when we go bush.

Happy ponderings.

I did a trip to Cape York in 2001 and was running 285/75R16 & had 2 spares. On the way up, totally stuffed 1 tyre. So, diverted into Weipa as I thought I'd get a spare there.

I searched everywhere in Weipa, both for new and secondhand, but no luck sourcing a replacement. The only option, which I didn't take was to air freight one in.

No, admittedly, that was 5 years ago and things might've changed since.

Fifo

Most common sizes off the beaten track are 750R16, 235/85R16, 265/75R16 and 31x10.5R15. The 285/75R16 can be hard to find, while the 33's are very hard to find.

I'm guess you're talking a 75series LandCruiser here because the '95 80series couldn't take the 15inch rims.