245/75/16 A/T Tyre Pressures

**68wicksy** · 20th July 2010, 04:34 PM

Hi
Hoping someone out there running 245/75/16 All Terrain tyres can give some insight into the best pressure to run for daily highway driving.

I had a suspension stuff 2" lift put in a couple of weeks ago, as well as a new steering damper. At the time I was running some fairly worn 245/70/16 at 2psi over landrover spec'd pressures, and all was fine.

Had 5 new tyres fitted on Saturday in the slightly larger size, and Bob Jane inflated them all to 38psi. Vehicle is very twitchy, and now has some turn in oversteer (which is unnerving a tall 4wd). I will drop them back to 28/36psi tomorrow and see if that helps, but would appreciate the benefit of others experience with this tyre size/type.

Cheers

**luke68** · 21st July 2010, 09:02 AM

I'm running 245/70 All terrains with 36psi front and rear. I find it gives good grip and a bit of give on the rougher bitumen. during the Wet season I drop them down to about 32psi.

Hope this helps

**Spel1** · 23rd July 2010, 04:29 PM

I've done 40k km on this size AT tyre, I run 32 at the front and 34 in the rear with no load, a bit more in the back ones if loaded - been pretty stable.

**2_door** · 23rd July 2010, 05:58 PM

I ran 32 front and 34 rear in mine. 38 would certainly make the steering twitchy.

**Narangga** · 23rd July 2010, 06:05 PM

I have just got some 245/75R16 Goodyear Slient Armor's for my D2 and on the sidewall it has:

"Serious injury may result from tyre failure due to overinflation/underinflation. Follow the owner's manual or tyre placard in the vehicle."

Your 28/36 sounds like a good bet.

**harry** · 23rd July 2010, 06:50 PM

if you aren't carrying a load, just follow the door sticker, although your tyres are bigger than the sticker, it atill works.
although i run 28 f/30-35r
and drop to 18 or a bit less in the softor difficult stuff.
generally, the bigger the tyre, the lower the pressure.
when i got my duggy diesel in sidney, it had 40 in all, it was a pig to drive and very uncomfortable, let the tyres down to 30 and it was a different car.
do not listen to all those toyo drivers that think you have to drive with truck pressures, it's crap.

**68wicksy** · 24th July 2010, 07:08 AM

Thanks everyone for your replys.

Dropping the pressures has made a huge difference. I have settled on 26/32 as being the best unloaded pressure combo at present. Will just have to see how they wear at those pressures.

**ozscott** · 24th July 2010, 07:25 AM

Depends on the tyre rating too. I run 245/75/16 Maxxis Bravo AT in the LT's and their max pressure is 80psi. I normally run 40 in the rear and 35 in the front, but towing the Vagabond the rear goes up to 60. Mine is stock height. It has a Raw steering dampener and set of Coilrights in the rear - before the coils bags it handled very well and predictably with no step over steer etc but the bags made it better again. I know this is a wider track and different specs to the D1 but it might be of assistance. I have 245/70/16 on my D1 so cant comment on that.

Cheers

**dullbird** · 25th July 2010, 06:06 PM

Well Im on the other end of the scale although my 245/75 are bighorns I run them at 40 yes the ride is harder but the car pulls better and I personally think it doesn't fell like a boat going around corners.
My A/T are 245/70s and I run similar pressure and I feel the same way. When off roaring I tend to drop around to around 24psi don't usually need to go any lower

I personally think it's down to the tyres you use and the level of I comfort and handling you can handle. Probably has something to do with your suspension set up too. I think pressures are a personal choice.

Lore · 27th October 2011, 09:09 PM

Pirelli did a lot of research on this a few years back and came up with what they call the "4 pound rule". Pump the tyres to what you think is the correct pressure cold, then go for a decent drive until the tyres are up to temp for the load and conditions you normally operate in. Then check the pressures again. If the cold pressure is correct, then the hot pressure will be exactly 4 pounds higher. If they have climbed by more than 4 pounds, then once the tyres are cold again, lift them by the amount they were over (eg if hot pressure was 6 pounds, lift cold pressure by 2 pounds) if the pressure difference was less than 4 pounds, then drop the cold pressures (eg if it only lifted 2 pounds, then your cold pressures were 2 pounds too high).

If you use your vehicle for more than one purpose, like unloaded for the daily grind and packed to the gunwales for touring, then this will give you the ability to keep a record of the correct pressures for each use.

Of course this is for road use, use normal offroad lore for track/rock/sand pressures.

Hope this helps

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