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Old 07-08-2011, 12:27 AM   #1
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2011 Wrangler Tire PSI QUESTIONS. I am dumb!

This whole PSI thing confuses me and in all the cars I have owned I have always been confused about this I am hoping that someone can help me understand what's a safe PSI for my tires. I read so much information..so many people have tried to explain to me, but I just feel stupid. Most of what I read is more so for upgraded wheels and tires so I not sure what applies to me and what doesn't... People have said no one ever follows what the sticker says is that because the ride is so poor?

I have 2011 Wrangler Sport all stock tires and wheels. The tires are 225/75r16 bsw on/off road tires. They are Goodyear Wrangler ST's. The Cheap base tires and wheels.... The door sticker says Cold Pressure is 35psi, but when I had them set to that it felt like I was driving on rocks I could feel pebbles in the road. I could feel everything and hear every single noise the jeep made. So I have been dropping them to over the last couple days per other Jeep owners which seems to be a standard practice of jeep owner. I am at 30psi now and it feels so much better. However, I do lots of long highway drives and was wondering over time is going to lesson the life of my tires? or make them overheat and result in failure? I would even go a little lower if I know that the tires I have could handle it.. Its only me in the Jeep for the most part and on occasion one other adult and small kids and on occasion 2 bikes on the back, so I cant see that requiring me to add air. I want the Jeep to ride smoother, but I don't want to make it unsafe. One more thing how can I tell what size tires I am running meaning 30's 40's etc.
I am going to want to take it off road, however, I want to do that when I get new wheels and tires which would not happen till next summer, so till then if its only going to be a street car I want it to be some what comfortable and safe for my family...
So far this jeep forum has answered so many questions I have had. Its a great tool have.. thank you!

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Old 07-08-2011, 12:50 AM   #2
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This whole PSI thing confuses me and in all the cars I have owned I have always been confused about this I am hoping that someone can help me understand what's a safe PSI for my tires. I read so much information..so many people have tried to explain to me, but I just feel stupid. Most of what I read is more so for upgraded wheels and tires so I not sure what applies to me and what doesn't... People have said no one ever follows what the sticker says is that because the ride is so poor?

I have 2011 Wrangler Sport all stock tires and wheels. The tires are 225/75r16 bsw on/off road tires. They are Goodyear Wrangler ST's. The Cheap base tires and wheels.... The door sticker says Cold Pressure is 35psi, but when I had them set to that it felt like I was driving on rocks I could feel pebbles in the road. I could feel everything and hear every single noise the jeep made. So I have been dropping them to over the last couple days per other Jeep owners which seems to be a standard practice of jeep owner. I am at 30psi now and it feels so much better. However, I do lots of long highway drives and was wondering over time is going to lesson the life of my tires? or make them overheat and result in failure? I would even go a little lower if I know that the tires I have could handle it.. Its only me in the Jeep for the most part and on occasion one other adult and small kids and on occasion 2 bikes on the back, so I cant see that requiring me to add air. I want the Jeep to ride smoother, but I don't want to make it unsafe. One more thing how can I tell what size tires I am running meaning 30's 40's etc.
I am going to want to take it off road, however, I want to do that when I get new wheels and tires which would not happen till next summer, so till then if its only going to be a street car I want it to be some what comfortable and safe for my family...
So far this jeep forum has answered so many questions I have had. Its a great tool have.. thank you!
answering the tire size question. take the first number divided by 25.4 to get width. multiply the width by the second number/100 double and add to rim size

example P225/75/16 would be approx (225/25.4) = 8.98 in wide by ((8.98*.75*2)+16) = 29.3 in
unless I messed up the math somewhere

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Old 07-25-2011, 09:45 AM   #3
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with those size tires what would be a good PSI for them?
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Old 07-25-2011, 09:50 AM   #4
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Originally Posted by IowaRaider View Post
answering the tire size question. take the first number divided by 25.4 to get width. multiply the width by the second number/100 double and add to rim size

example P225/75/16 would be approx (225/25.4) = 8.98 in wide by ((8.98*.75*2)+16) = 29.3 in
unless I messed up the math somewhere
Or you could use this: Car / SUV / Van / Light Truck Tire Calculations
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Old 07-25-2011, 09:51 AM   #5
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with those size tires what would be a good PSI for them?
Go with what the door sticker says.
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Old 10-27-2014, 09:43 PM   #6
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yes, door sticker is what I would go by, mine is 35psi

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