Thread: 18 inch AT's vs 16 inch All Terrains

I've used the 18" wheels (SE Td5 2a) to do Flinders Ranges, Oodnadatta, Simpson, Birdsville, Innaminka, Vic High Country, etc.

They did very well with std size 255/55-18 tyres.

Only weakness was the tyres themselves.

I used Nitto Terra Grappler and Grabber AT2 tyres but couldn't get them in LT construction - thus they were a bit susceptible to rock punctures if travelling too fast but otherwise great on all surfaces.

After the Simpon trip I went to 8" wide 16" Land Rover alloys and BFG AT and am very happy with all aspects: off road, rock protection, on road handling (does have ACE). Went for 255/70-16 which gives a little more diameter and still fits on the rear door, no rubbing or issues anywhere.

However, the 'new' BFG AT KO2 comes in a 255/55-18 with LT and to be honest, I would've preferred to just do that, rather than the cost of buying the new wheels and having the old ones lying around the place (gotta chuck them out at some stage...).

cheers,

bidds

A lot depends on the speed you're travelling, load you're carrying and the wheels you're using. The LR wheels have a 'dual bead' (not sure if that's the correct terminology) on the outside that let you run crazy low pressures if you need to, even the 18"s.

I've run the same wheel/tyres for years in the Vic high country, Stocko, the Brindies, Innamincka, Uluru, the Simpson and Birdsville.

For general dirt tracks at speeds up to around 70km/hr and close to GVM, I'd run 20psi front/25psi rear. Softens the ride, improves grip and reduces chances of puncture with non-LT tyres (Nitto Terra Grappler, General Grabber AT2).

For sand (Stockton and Simpson) I ran 10/15 but wouldn't go over 40km/hr except for very short periods to get the occasional run up a large dune. Hit about 70km/hr to get over Big Red but again, that's only for a short time. Do avoid sharp turns at higher speeds with low pressures if the sand is hard, like near the water on the beach. The LR rims never let the tyres roll off for me but it's not something you want to learn the hard way.




QUOTE=MaoriD2a;2684819]Can anyone tell me some offroad pressures for the 255 55 18s,dirt tracks some bog holes and beach work?[/QUOTE]