snytribe

discount tire had my Falken 287/70R17's at 40. I lowered them to 35 and it does feel better. After reading earlier post thinking I might go even lower.

optimuus Prime

Yea your right the Max is 50 lbs,

optimuus Prime

That's where I got mine and they put them on, Theres no operating pressure on the tire just the max pressure so I guess the installer thought it was the tire pressure.

ronjenx

Seems like I hear more and more about tire shops inflating to the max pressure before letting the vehicle roll out the door.
It's probably a misguided attempt to decrease their liability.

optimuus Prime

I don't know but I don't want my brand new tires wearing all jacked up so I lowered the psi to around 35ish might move it down a little more I'm going to see how it wears the new rubber teats down now.

Mr Jeepster

I contacted the Nitto Tire Company directly about what tire pressure their engineers recommend for 285 70 17s on a 2012 Wrangler Unlimited 4 dr and this is what they said:



Thank you for contacting Nitto Tires.

In response to your question, we recommend 44 PSI for your Trail
Grappler [285/70R17] on your 2012 Jeep Wrangler Unlimited 4 Door.
Please note that this number is a calculated estimate, please feel free
to make any adjustments until you have achieved a comfortable ride.


If you have any other questions, please feel free to contact us back at
any time.

Thank you,
Nitto Technical Department

thedrod

The Max Pressure written on the tire is worthless in regards to "proper inflation."

Do a chalk test or drop it to 30 and call it a day.

snakeyes76

chalk test. running 34 psi on my 315/70/17s. 285/70/17 would probably run at 35 or 36 psi.
depends also on if you want a nice cushy ride or fuel savings as more psi = less resistance

atomthompson

Proper wear/tread life depends on more than just tire size. It also depends on rim width, tread pattern, the true size of the tire, and vehicle weight. The chalk test is the best way of checking to see if your tire will wear nicely. Do the chalk test to get them to where they wear evenly and then adjust for comfort/gas savings. You can run your tires at 65 psi (if they're rated for it) and save some fuel, but you'll also burn off the center tread far sooner and have to buy 4 new tires that have near perfect tread on the outer edge. Also keep in mind that if you tow a trailer/camper or put 500+ lbs in the back of your rig for a trip then you will want to add some more air to the rear tires. Basically, use what others have said as a reference and then adjust for your rig. You might have 1,000 lbs more or less on your vehicle than what they have. Recheck whenever adding/removing significant weight or changing rims/tires.

eumel789

That is MAX pressure and only needed if you load your vehicle to the max and/or tow! Nobody puts that much air in it on a Jeep! Look at the load range per tire and you'll see what I mean