psi question , coopers stt - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Jeep Discussions > Tires & Wheels

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-22-2012, 04:31 AM   #1
Jeeper
 
GiantSchnauzer's Avatar
 
Join Date: Nov 2011
Location: DUBAI
Posts: 133
psi question , coopers stt

33x12.50x17 cooper stt load range D max press 50psi on 17x9 rims,

I have had no time to do the chalk test, from the dealer they where filled up to 39is and I aired them down to 33 but appears from the dust on the tires left by the street they need to perhaps go down to 31ish . Is this an ok psi area until i test with chalk?, not sure because its my first "d" range tire. Rides better just sounds a shitload under 50 if i air down any more.

GiantSchnauzer is offline   Quote
Old 08-22-2012, 06:13 AM   #2
Jeeper
 
Jeepin_Dad's Avatar
 
Join Date: Oct 2011
Location: Oxford PA
Posts: 311
On my 2 door JK I normally run my D rated Cooper Discoverer S/T, 285/75R16 (33x11.5), at 28 psi on the street. I am on my second set after getting 65,000 miles out of the first set and have 20,000 miles on this set and get pretty even tire wear at this pressure.

If I am towing my camper or have it loaded heavily for a family road trip I'll air up to 32 psi and off-road I air them down to 10-15 psi depending on the terrain.

__________________
Topless For TATAs
August 10 & 11, 2013 at Rausch Creek Off-Road Park
For More Info Click Here:
5th Annual Topless for TATAs at Rausch Creek
Jeepin_Dad is offline   Quote
Old 08-22-2012, 07:50 AM   #3
Jeeper
 
GiantSchnauzer's Avatar
 
Join Date: Nov 2011
Location: DUBAI
Posts: 133
Thanx jeeping, ill try 30psi and see how it looks. Just wanted to make sure i am not lowering the pressure too much in relation to the max psi.
GiantSchnauzer is offline   Quote
Old 08-22-2012, 04:51 PM   #4
Jeeper
 
Smitty4x4's Avatar
 
Join Date: Jul 2012
Posts: 422
If you can find a load vs. inflation table for them it will tell you exactly what to run. I've run as low as 25 for that size. You'll find that most run them between 27 and 30 psi. Don't worry about the number on the sidewall. That's the Max. Look at the sticker in the door jam. That tire should be the same or a couple of pounds less than factory spec but no Morse than what Jeep recommends unless its packed full and loaded heavy.
Smitty4x4 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 07:31 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC