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Old 01-11-2019, 09:53 PM #1
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5 lbs of air makes a difference

I had low air at my oil change @31 per tire so put 36 in and that still didn't improve the ride. I looked closer at my tires and they indicate 55 max cold. 265/55/17...

I only have them at 41 now but might go to 44.. steering bounce over random bumps is a ton better. I was actually starting to become disappointed in my 6-month-old KYB struts, but it was just winter cold draining my air.
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Old 01-11-2019, 10:17 PM #2
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Cool... run what feels and works best for you within the tires limits.

It helps to know what tire and load range you are actually working with it... perhaps others can chime in with their experiences.
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Old 01-11-2019, 11:34 PM #3
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I'm running 36lbs in my stock 2014 tires. The funny thing is my tire pressure light came on the other day. I drove home and parked in the garage. Next morning went out and checked pressure. 36lbs in all four. But, the idiot light is still on!
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Old 01-11-2019, 11:59 PM #4
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Quote:
Originally Posted by Frederick1 View Post
I'm running 36lbs in my stock 2014 tires. The funny thing is my tire pressure light came on the other day. I drove home and parked in the garage. Next morning went out and checked pressure. 36lbs in all four. But, the idiot light is still on!
Check the spare, theres a TPMS on there too.
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Old 01-12-2019, 12:02 AM #5
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Quote:
Originally Posted by Frederick1 View Post
I'm running 36lbs in my stock 2014 tires. The funny thing is my tire pressure light came on the other day. I drove home and parked in the garage. Next morning went out and checked pressure. 36lbs in all four. But, the idiot light is still on!
Spare tire.
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Old 01-12-2019, 12:15 AM #6
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Thanks guys! I never thought of that.
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Old 01-12-2019, 07:39 AM #7
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If your doing most driving on pavement your tires will wear in the center much faster! You don't go by the tires inflation rating, you go by what the vehicle manufacturer recommends, that is if you want even tire wear.
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Old 01-12-2019, 08:56 AM #8
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Just an fyi, if a tire is overpressurized then the light will go on too. Alot of manufacturers are doing this now. Not on ours but newer vehicles.
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Old 01-12-2019, 09:35 AM #9
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Quote:
Originally Posted by Jim_A View Post
If your doing most driving on pavement your tires will wear in the center much faster! You don't go by the tires inflation rating, you go by what the vehicle manufacturer recommends, that is if you want even tire wear.
In my experience, what you mention here is only applicable when using tires of the same size and load rating the vehicle came with. Once you deviate from that, as most here do, you have to go by the recommendation of the tire manufacturer, or experiment to find the best balance of ride quality and wear. Obviously how the vehicle is being used makes a difference too. For example, you may want to increase pressure if doing mostly highway driving and towing, where for off road, you generally have to air them down, depending on terrain. For my situation with 265/70/17 Wildpeak AT3W tires, Ive found 38psi to be the sweet spot for everyday driving.
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Old 01-12-2019, 10:26 AM #10
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Quote:
Originally Posted by Terminator03 View Post
In my experience, what you mention here is only applicable when using tires of the same size and load rating the vehicle came with. Once you deviate from that, as most here do, you have to go by the recommendation of the tire manufacturer, or experiment to find the best balance of ride quality and wear. Obviously how the vehicle is being used makes a difference too. For example, you may want to increase pressure if doing mostly highway driving and towing, where for off road, you generally have to air them down, depending on terrain. For my situation with 265/70/17 Wildpeak AT3W tires, Ive found 38psi to be the sweet spot for everyday driving.
There are many variables, I'm talking generally speaking.
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Old 01-12-2019, 11:38 AM #11
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Check the spare, theres a TPMS on there too.
I learned that and putting air in with the valve on top was a blast.
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Old 01-12-2019, 02:28 PM #12
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I don't care what a vehicle mfr says to do with tires. They didn't manufacture or test that tire. The tire company did. Remember all those Ford Explorers flipping over? Ford was telling people to way under inflate the tires for a more comfortable ride. The tire is the only part of your vehicle that touches the road, so I do what they say.
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Old 01-12-2019, 02:41 PM #13
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Only if your running the OE sized tire

Quote:
Originally Posted by Jim_A View Post
If your doing most driving on pavement your tires will wear in the center much faster! You don't go by the tires inflation rating, you go by what the vehicle manufacturer recommends, that is if you want even tire wear.
otherwise you go by the tires inflation rating b/c it is based on that specific tire size ...
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Old 01-12-2019, 05:10 PM #14
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Quote:
Originally Posted by BlackCloud View Post
I don't care what a vehicle mfr says to do with tires. They didn't manufacture or test that tire. The tire company did. Remember all those Ford Explorers flipping over? Ford was telling people to way under inflate the tires for a more comfortable ride. The tire is the only part of your vehicle that touches the road, so I do what they say.
Correct me if I'm wrong, but I'm not aware of tire manufacturers providing a recommended inflation, there's too much variance between vehicles for a one-size-fits-all recommendation. They DO provide a max inflation rating, which is just that, the maximum. You don't want to be running that or you're in for a harsh ride and uneven wear.

When I switched to 265/70/17 Falkens, I started at 35, but after noticing the center wearing more than the sides, dropped down to 33 and that fixed it, plus it feels a little more stable at highway speeds.

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Old 01-13-2019, 10:42 PM #15
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Tire manufacturers only specify maximum inflation pressure. This has no correlation to the "correct" inflation pressure. Their are two good ways to check for "proper" tire pressure. The chalk method (which you can google) and the temperature test (below). Both of these tests are meant to make sure that tire pressures used are creating the ideal contact patch between the tire and pavement. In my experience, even tires of wildly different characteristics and sizes, when mounted on the same vehicle, are usually happiest at or near the pressures indicated on the vehicle manufacturers door placard.

This isn't a one size fits all thing though... If your rock crawling the "best' pressure might be significantly lower, and if your towing the "best" pressure might be significantly higher. YMMV (literally). You may personally prefer higher or lower pressures for efficiency or comfort, but any pressure that compromises the contact patch may upset the handling dynamics of the vehicle or cause excessive tire wear. If you and your wallet are okay with wearing out tires a little faster for the sake of comfort... then gal' dern it, I won't judge ya'.

For those interested the temperature tire pressure method is:
1) Drive the vehicle normally for ten to fifteen minutes.
2) Stop the vehicle in a safe location and, using a non-contact thermometer, measure the temperature of the tire tread in three places. Once at the outside edge of the tread, once in the center of the tread, and once at the inside edge of the tread.
3) Compare these temperatures. A properly inflated tire will show that all three temperatures are approximately equal.

Significant temperature differences (>5 degrees F) indicate improperly inflated tires or suspension/alignment issues and can be interpreted as follows:

If temperatures are read from outside to inside and indicate
High, low, high = tires under-inflated
Low, high, low = tires over-inflated
Low, high, high = Excessive toe out or negative camber
High, high, low = Excessive toe in or positive camber

The temperature test does not require letting the tires cool between testing. If pressures are off add/release air and repeat.

Sorry if this is all a bit dry, but... science!
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Last edited by ElZilcho; 01-19-2019 at 02:19 AM. Reason: Screwed up my math symbols...
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