Air pressure for 245/75R17 BFGoodrich All Terrians - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 10 (permalink) Old 10-23-2009, 07:42 PM Thread Starter
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Air pressure for 245/75R17 BFGoodrich All Terrians

35 psi seems to low for the 245/75R17 BFGoodrich All Terrians. I know you can do the chalk test, but was hoping somebody already did it and share the psi for the tires?
Thanks!
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post #2 of 10 (permalink) Old 10-23-2009, 07:57 PM
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Did you search for this test? I could not find anyone who did one.



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post #3 of 10 (permalink) Old 10-23-2009, 08:25 PM
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Did you search for this test? I could not find anyone who did one.
https://www.jeepcommander.com/forums/showpost.php?p=134028&postcount=49

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post #4 of 10 (permalink) Old 10-23-2009, 09:12 PM
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Originally Posted by 4estjp View Post
35 psi seems to low for the 245/75R17 BFGoodrich All Terrians. I know you can do the chalk test, but was hoping somebody already did it and share the psi for the tires?
Thanks!
My dad explained exactly how tire presure works a few weeks ago and I remember him mentioning it having something to do with the width of the tire. Not so much the height. Since its the same width tire as stock id imagine 35 psi is fine.

What makes you think 35 psi is to low? Are the outside treads wearing faster then the tread in the middle of the tire?




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Last edited by 07JeepXK; 10-23-2009 at 09:21 PM.
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post #5 of 10 (permalink) Old 10-23-2009, 09:17 PM Thread Starter
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They're brand new...It looks like the sides bulge out as if there isn't enough air compared to the stock tires. Looks like they are aired down to go off road. Doesn't the bigger the tire the less air pressure it takes to hold the same weight?
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post #6 of 10 (permalink) Old 10-23-2009, 09:22 PM
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Quote:
Originally Posted by 4estjp View Post
They're brand new...It looks like the sides bulge out as if there isn't enough air compared to the stock tires. Looks like they are aired down to go off road. Doesn't the bigger the tire the less air pressure it takes to hold the same weight?
What is the max. psi of the tires and what is the load range?




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post #7 of 10 (permalink) Old 10-23-2009, 09:57 PM Thread Starter
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load E
PSI 80
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post #8 of 10 (permalink) Old 10-23-2009, 10:06 PM
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Hmmm, maybe you do need a little more air in them then. I dont think the side walls should be bulging that much on a load range E tire. It wont hurt to add more psi since the max. pressure is 80. Id say bump them up to 40 psi and see if that helps any.




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post #9 of 10 (permalink) Old 10-23-2009, 10:45 PM Thread Starter
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I'll try that and see how it works.
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post #10 of 10 (permalink) Old 10-23-2009, 10:56 PM
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Quote:
Originally Posted by 4estjp View Post
They're brand new...It looks like the sides bulge out as if there isn't enough air compared to the stock tires. Looks like they are aired down to go off road. Doesn't the bigger the tire the less air pressure it takes to hold the same weight?
You can't tell by looking at a tire if it is properly inflated.

Checking proper tire inflation is rather simple and requires some chalk or a utility crayon.

Make a mark all the way across each tire.

Drive the Jeep for a short distance, a straight line is best.

Note the wear pattern in the chalk. If there is chalk left at the edge the tire is over inflated. Chalk left in the center means it's under-inflated. A clean pattern indicates the pressure is just right. Make a note of the pressure for future reference. This procedure would need to be performed again of different size or style tires are added.


Chalk Line


Over Inflated


Proper Inflation

2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
Interior: Dark Slate/Light Graystone with Saddle Brown Leather Seats
Quadra-Drive II, NAV, DVD, Trailer Tow Group IV, Off-Road Group II, Remote Start, UConnect, Rear Backup Camera, Chrome Wheels,
Magnaflow cat-back exhaust, Daytime Running Lights enabled, 2" Rough Country Lift with 265/70R17 Goodyear Wrangler AT/S

Last edited by jeep5253; 10-23-2009 at 11:00 PM.
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