- Status
lxskllr
No Lifer
- Nov 30, 2004
- 60,165
- 10,626
- 126
My Jeep came with passenger tires, as do many pickups. The Cherokee is virtually a 3/4 ton truck. I used to haul firewood in it, so I needed the extra load capacity. I also used it on and off for work purposes, and needed the thicker sidewalls and tread.
skyking
Lifer
- Nov 21, 2001
- 22,781
- 5,941
- 146
Clearly fleabag knows more than the tire manufacturers do regarding proper inflation:
http://www.michelinman.com/tir...ips/air-pressure-tips/
Now see here, on the first page about proper inlfation, the michelin man says this
"If you don?t know the proper inflation air pressure for your tires, what do you do?
Easy. Check at one of the following places on your vehicle:
* In the vehicle owners manual.
* On the vehicle?s door jamb. (Often, a vehicle information placard is located on the door jamb along with the recommended tire inflation pressure.)
* Inside the fuel hatch filler flap. (In some vehicles.)
* The glove compartment door. (In some vehicles.)
o But NOT on the tire. The inflation pressure shown on the tire sidewall is only the maximum tire inflation pressure. In most situations, the vehicle manufacturers recommended tire inflation pressure is shown on the vehicle placard. However, on some older vehicles, the recommended pressure listed by your vehicle?s manufacturer may be shown as two numbers: One for city speed driving and normal load and one for highway speeds and/or maximum capacity vehicle load. Be sure to inflate your tires to the recommended inflation pressure for each type of driving situation.
"
That michelin man guy MUST be an idiot.
http://www.michelinman.com/tir...ips/air-pressure-tips/
Now see here, on the first page about proper inlfation, the michelin man says this
"If you don?t know the proper inflation air pressure for your tires, what do you do?
Easy. Check at one of the following places on your vehicle:
* In the vehicle owners manual.
* On the vehicle?s door jamb. (Often, a vehicle information placard is located on the door jamb along with the recommended tire inflation pressure.)
* Inside the fuel hatch filler flap. (In some vehicles.)
* The glove compartment door. (In some vehicles.)
o But NOT on the tire. The inflation pressure shown on the tire sidewall is only the maximum tire inflation pressure. In most situations, the vehicle manufacturers recommended tire inflation pressure is shown on the vehicle placard. However, on some older vehicles, the recommended pressure listed by your vehicle?s manufacturer may be shown as two numbers: One for city speed driving and normal load and one for highway speeds and/or maximum capacity vehicle load. Be sure to inflate your tires to the recommended inflation pressure for each type of driving situation.
"
That michelin man guy MUST be an idiot.
I inflate a few psi over the door-jam on my Accord because it noticeably reduces sidewall roll-over on my rather demanding commute. Anything over that and the ride becomes punishing and handling is significantly deceased because the tires skitter over rough stuff instead of absorbing it and holding on. I can see the wear patterns on the tires and when over-inflated, they wear down the middle, even though I mostly do high-speed cornering on my mountain-road commute. These are fairly high-profile tires by today's standards (60 aspect ratio) and are hard-compound all-weathers. In short, I've tried both ways and inflating to the sidewall max is a bad idea for a number of reasons.
On my S2000, I inflate to the door-jam exactly. The ride is already very stiff and the tires are low-profile, so I already have issues with them skittering over bumps in corners. The last thing I need is more pressure on street roads. The fronts wear evenly and the rears wear on the inside due to factory-spec camber. Increasing tire pressure would only make the inside wear worse by making the tires stand up on the inside edge. You cannot rotate tires on this car (staggered directionals), so again, inflating to sidewall max would be a bad idea for a number of reasons.
Lots of very smart people get paid lots of money to figure out the right pressure for each car. And my experience has shown them to be right most of the time.
On my S2000, I inflate to the door-jam exactly. The ride is already very stiff and the tires are low-profile, so I already have issues with them skittering over bumps in corners. The last thing I need is more pressure on street roads. The fronts wear evenly and the rears wear on the inside due to factory-spec camber. Increasing tire pressure would only make the inside wear worse by making the tires stand up on the inside edge. You cannot rotate tires on this car (staggered directionals), so again, inflating to sidewall max would be a bad idea for a number of reasons.
Lots of very smart people get paid lots of money to figure out the right pressure for each car. And my experience has shown them to be right most of the time.
JulesMaximus
No Lifer
- Jul 3, 2003
- 74,584
- 985
- 126
I think we should chip in and get fleabag a fleshlight, would keep him out of the forums for a while, and he could overinflate that all day, possibly earning himself a Darwin award
Zenmervolt
Elite member
- Oct 22, 2000
- 24,514
- 44
- 91
I inflate my tires to custom values based on the desired handling characteristics.
The 951 recommends 2.5 bar (36 PSI) on all four tires. However, the car is set up from the factory for slight understeer. I run 42 PSI front and 38 PSI rear, which increases cornering grip in dry weather by reducing sidewall flex and also moves the car from slight understeer to neutral. Wet traction is slightly reduced, road noise increases fairly significantly (though the tires have an aggressive tread), and ride quality is noticeably more harsh. Tire wear is variable because the car is tracked which renders standard wear evaluation meaningless.
The S70 recommends 32 PSI on all tires for full load and 28 PSI on all tires for "comfort". I typically run 36-38 PSI front and 32 PSI rear. This increases front grip and significantly counters the inherent understeer of a front wheel drive car. Ride quality is degraded and there is a slight increase in road noise. There is also significantly more kickback through the steering due to the resultant increased tendency of the front tires to "bounce" off of sharp bumps because of higher pressures.
I have not seen any differences in fuel economy as a result of my adjusted tire pressures and I would not recommend blanket pressures to anyone who isn't attempting to adjust the handling of his or her vehicle. The sticker on the car's door should be used as a starting point from which one deviates a little at a time until arriving at a combination that suits one's driving habits.
ZV
The 951 recommends 2.5 bar (36 PSI) on all four tires. However, the car is set up from the factory for slight understeer. I run 42 PSI front and 38 PSI rear, which increases cornering grip in dry weather by reducing sidewall flex and also moves the car from slight understeer to neutral. Wet traction is slightly reduced, road noise increases fairly significantly (though the tires have an aggressive tread), and ride quality is noticeably more harsh. Tire wear is variable because the car is tracked which renders standard wear evaluation meaningless.
The S70 recommends 32 PSI on all tires for full load and 28 PSI on all tires for "comfort". I typically run 36-38 PSI front and 32 PSI rear. This increases front grip and significantly counters the inherent understeer of a front wheel drive car. Ride quality is degraded and there is a slight increase in road noise. There is also significantly more kickback through the steering due to the resultant increased tendency of the front tires to "bounce" off of sharp bumps because of higher pressures.
I have not seen any differences in fuel economy as a result of my adjusted tire pressures and I would not recommend blanket pressures to anyone who isn't attempting to adjust the handling of his or her vehicle. The sticker on the car's door should be used as a starting point from which one deviates a little at a time until arriving at a combination that suits one's driving habits.
ZV
sorry.
- Nov 30, 2005
- 50,231
- 118
- 116
GuitarDaddy
Lifer
- Nov 9, 2004
- 11,465
- 1
- 0
If the tires are original factory equipment I go with the mfgs recomended on the door panel, if the tires are aftermarket I just use my best judgement on how they handle and feel and stay below the sidewall max.
I replaced the factory Goodyear Eagle TA's on my car with better rated BF Goodrich tires at about 35k, the door panel said 30psi and the sidewall max was 44psi. After some testing and driving I settled on 35psi, the Eagles seemed to like 30psi but the Goodriches just seemed a little soft at 30.
I replaced the factory Goodyear Eagle TA's on my car with better rated BF Goodrich tires at about 35k, the door panel said 30psi and the sidewall max was 44psi. After some testing and driving I settled on 35psi, the Eagles seemed to like 30psi but the Goodriches just seemed a little soft at 30.
skyking
Lifer
- Nov 21, 2001
- 22,781
- 5,941
- 146
Need more links?
Here's another that talks about that sidewall information at length.
http://www.tirerack.com/tires/...techpage.jsp?techid=21
The story goes that he got laughed out of The Garage forum so he felt the need to repost here.
That's what I hear, anyway...
Disadvantages of Overinflation
An overinflated tire is stiff and unyielding and the size of its footprint in contact with the road is reduced. If a vehicle's tires are overinflated by 6 psi, they could be damaged more easily when encountering potholes or debris in the road, as well as experience irregular tread wear. Higher inflated tires cannot isolate road irregularities as well causing the vehicle to ride harsher and transmit more noise into its interior. However, higher inflation pressures reduce rolling resistance slightly and typically provide a slight improvement in steering response and cornering stability. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures
Okay, so you claim you and others have tested MPG by inflating tires to a high PSI and in return got better gas mileage. Have you tested tire wear on highly inflated tires in a controlled envrionment? I would tend to believe all of the reputable websites out there that claim over inflating your tires can cause reduced wear and in some cases less traction. So all of your BS about tires being SAFER when over inflated don't hold true, you can still argue that you get better gas mileage but that's a retarded argument in the overall scheme of things.
An overinflated tire is stiff and unyielding and the size of its footprint in contact with the road is reduced. If a vehicle's tires are overinflated by 6 psi, they could be damaged more easily when encountering potholes or debris in the road, as well as experience irregular tread wear. Higher inflated tires cannot isolate road irregularities as well causing the vehicle to ride harsher and transmit more noise into its interior. However, higher inflation pressures reduce rolling resistance slightly and typically provide a slight improvement in steering response and cornering stability. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures
Okay, so you claim you and others have tested MPG by inflating tires to a high PSI and in return got better gas mileage. Have you tested tire wear on highly inflated tires in a controlled envrionment? I would tend to believe all of the reputable websites out there that claim over inflating your tires can cause reduced wear and in some cases less traction. So all of your BS about tires being SAFER when over inflated don't hold true, you can still argue that you get better gas mileage but that's a retarded argument in the overall scheme of things.
Anyways I already pointed out in the OP (which you obviously didn't read) that one can post links all day disputing anything I say about anything but I'm more interested in anecdotal evidence instead of generalize statements that releases them of responsibility, putting it squarely with the car manufacturer.
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