tire pressure

[Jester]

Hi guys.
I have Yokohama Geolandars on my Deli, and I'm wondering what pressure do others run them at for street use.
On the sidewalls it states something like max load 900kg @ 150PSI, but I don't presume they should be pressurized that high for everyday use...
I don't see any print for 'recommended inflation pressure' on the tire.
Right now, I'm running them at 50psi.
Any suggestions?

[EricN]

Tire size is kind of important to know. Quick and dirty way to check for the correct tire psi is to put chalk lines across the tread on all the tires, drive in a dead straight line, stop, check the wear on the chalk lines and adjust accordingly (keeping camber in mind). High tech and accurate way is to drive it on the highway for a few minutes, pull over, check the tire temps across the tread, adjust tire psi to make it as even as possible (taking camber angles into account). Simplest way of guessing, if the tires are larger than stock, in theory they should need less air pressure to carry the weight. I think the factory tire pressure is 2.0 bar? Maybe 2.2, cant remember. 30 psi would probably be close.

[coaxial]

150 PSI ????? that is insanity

[Jester]

Hmm..Thanks guys.
Maybe later I'll snap a picture of everything it states on the sidewall, to someone more experienced with tires it may make more sense than to me.
I know these are relatively popular, so I wander what pressure other people run them at.

[EricN]

The tire psi on the sidewall has nothing to do with what pressure to run on your vehicle. That is there so you know that max amount of load/at what pressure the tire is rated. So if in your case, you are driving a 3600kg Deli (8000lbs?) which is the maximum load that tire can take, then you would run the tire pressure listed on the sidewall. Which I suspect would be 50psi, 150 is pretty heffty.

[sid]

a 3600 kilo Delica?/ 2 of them weigh that

They weigh 1700 to 1800 kilos each give or take, just under 4000 lbs.

32 35 psi is a normal reasonable psi to run. I have bumped up the psi by 5 psi for extended highway trips with no problem. But overinflating is as dangerous as underinflating so if you arent sure, ask somebody who knows, and use common sense. 150 psi is just not a reasonable pressure for any vehicle tire that i can think of.

I think it probably said 50 psi on the sidewall of your Geolanders there for the max load rating, I would think that 50 psi is too much, try dumping about 15 psi and go with that.

hope this helps, oh and at least now we have cleared up the notion that a Deli weighs 4 tons.

sid

[coaxial]

I'm sorry but this thread is just reminding me too much of a part of the book Fear and Loathing in Las Vegas... brilliant writing by Hunter S. Thomson as usual:

Code: Select all

We made another turn and almost rolled again. The Coupe de Ville is not your ideal machine for high speed cornering in residential neighborhoods. The handling is very mushy . . .

unlike the Red Shark, which had responded very nicely to situations requiring the quick four-wheel drift. But the Whale Bad of cutting loose at the critical moment — had a tendency to dig in, which accounted for that sickening “here we go” sensation.

At first I thought it was only because the tires were soft, so I took it into the Texaco station next to the Flamingo and had the tires pumped up to fifty pounds each — which alarmed the attendant, until I explained that these were “experimental” tires.

But fifty pounds each didn't help the cornering, so I swent back a few hours later and told him I wanted to try seventy five. He shook his head nervously. “Not me,” he said, handing me the air hgose. “Here. They’re your tires. You do it.”

“What's wrong?” I asked. “You think they can't take seventy-five?”

He nodded, moving away as I stooped to deal with the left front. “You’re damn right,” he said. “Those tires want twenty eight in the front and thirty two in the rear. Hell, fifty’s dangerous, but seventy five is crazy. They’ll explode!”

I shook my head and kept filling the left front. “I told you,” I said, “Sandoz laboratories designed these tires. They're special. I could load them up to a hundred.

“God almighty!” he groaned. “Don't do that here.”

“Not today,” I replied. “I want to see how they corner with seventy-five.”

He chuckled. “You won't even get to the corner, Mister.”

“We'll see,” I said, moving around to the rear with the air- hose. In truth, I was nervous. The two front ones were tighter than snare drums; they felt like teak wood when I tapped on them with the rod. But what the hell? I thought. If they ex plode, so what? It's not often that a man gets a chance to run terminal experiments on a virgin Cadillac and four brand- new $80 tires. For all I knew, the thing might start cornering like a Lotus Elan. If not, all I had to do was call the VIP agency and have another one delivered . . . maybe threaten them with a lawsuit because all four tires had exploded on me, while driving in heavy traffic. Demand an Eldorado, next time, with four Michelin Xs. And put it all on the card . . . charge it to the St Louis Browns.

As it turned out, the Whale behaved very nicely with the altered tire pressures. The ride was a trifle rough; I could feel every pebble on the highway, like being on roller skates in a gravel pit.., but the thing began cornering in a very stylish manner, very much like driving a motorcycle at top speed in a hard rain: one slip and ZANG, over the high side, cartwheel ing across the landscape with your head in your hands. 

[EricN]

a 3600 kilo Delica?/ 2 of them weigh that

My point exactly.

[docsavage]

I weighed my Delica at the scales in the log yard last year. A Chrystal Light High Roof weighs in at around 2200 kg with all seats, full tank and a driver - heavier than one might imagine.

James

(I'll weigh it again this weekend to see how much the hitch weighs)

[Erebus]

Factory spec is 2.0 bar, which is 29 psi. That's a lot low in my opinion. My tires are Bridgestone Dueler AT Revos (235r75/15) rated at a max of 50 psi. The tire dealer recommended I run at 35-40.

Someone posted quite a while ago, either here or the UK forum or a 4x4 forum, that you should take the maximum rating (in your case 3600kg @ 50 psi) and divide it by your vehicle's actual weight (say 2200 kg) to get the psi for your weight.

2200/3600 = x/50 gives an x of 30.5 psi

That works if the ability to carry the load is linear.

Just repeating what others have said. I run mine at 40

[marsgal42]

I run mine at 32 PSI. The front tires still look a little soft, but radials always do.

...laura