My Tire Hyper-Inflation Story... What's Yours?

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Originally Posted By: kr_bitog
Originally Posted By: AstroTurf

PS The Michelin website even allows for increased pressure (for this tire) Based on speed and load.
Look all the way down at the bottom... In the Fine Print. LOLz
http://www.michelinman.com/tire-selector/category/light-truck/ltx-m-s/tire-details/

Here below is the fine print,
they allow increase for higher speed but not for higher loading and not beyond pressure marked on tyre sidewall.

Inflation pressure increase must not exceed the maximumpressure branded on the tire sidewall. Whena customer requests a replacement tire with a lower speed rating than the original equipment tire, you must clearly communicate to him or her that the handlingofthe vehicle may be different, and that its maximum speed capability is limited to that of the lowest speed-rated tire on the vehicle. Exceeding the lawfulspeed limit is neither recommended nor endorsed.

For high-speed driving, additional inflation pressureand possibly reduced tire loading and/or upsizing is required. In the absence of specific recommendations by the vehicle manufacturer, usethe following guidelines based on those in the European Tyre and Rim Technical Organization Standards Manual.

For speeds over 160km/h (100 mph), load and inflation must be adjusted according to the table below.

S-Speed Rated Sizes:

Maximum Speed (mph) 100 106 112

Inflation Increase (psi) 0.0 1.0 2.0

Load Capacity(% of max.) 100 100 100



How can they allow for a psi increase without exceeding the sidewall psi?

Strange indeed, Jim
 
Originally Posted By: AstroTurf
How can they allow for a psi increase without exceeding the sidewall psi?

Strange indeed, Jim

They allow psi increase below the sidewall psi for cold measurement. Definitely after a few miles driving, this will exceed the sidewall psi, butbecause the tyre manufacturer has calculated some buffer on the design, specifically to the intended use, e.g. sedan or SUV/light truck, it is OK.
This is meant to reduce the temperature build-up on tyre, to reduce the risk of blowout due to overheat, but it does not change the fact that the sidewall only can stand for certain load and will burst if that is exceeded
 
Actually I you were to go back and look at the fine print, you would see that recommendation is for the Europeans... ONLY.

Jim
 
Originally Posted By: AstroTurf
Actually I you were to go back and look at the fine print, you would see that recommendation is for the Europeans... ONLY.

Jim

My guess is just because in the US there is no road with speed legal limit > 100 mph
 
Well actually their are.

But it just further shows that tire technology has not fully settled out yet.

Tires live and breath more than any other part on a vehicle.

Jim
 
Originally Posted By: AstroTurf
Well actually their are.

But it just further shows that tire technology has not fully settled out yet.

Tires live and breath more than any other part on a vehicle.

Jim

It is more on European and American still like to stick with their standard rather than compromising to one standard
grin.gif
 
HiHo Everyone,

I felt I should tell you that my Cold Inflation Pressure is over 35 psi, and under 51 psi.

I don't want anyone to worry that I might be overdoing it.

Have a Good One, Jim
 
Originally Posted By: AstroTurf
HiHo Everyone,

I felt I should tell you that my Cold Inflation Pressure is over 35 psi, and under 51 psi.

I don't want anyone to worry that I might be overdoing it.

Have a Good One, Jim


Well, this is the Michelin recommendation.

Michelin LTX inflation

If your hot pressure increase still below 7 psi, I think it is OK to maintain on 35 psi even though you may not like the S-tyre handling characteristic and do not put much load in the car or bite the bullet get the 225/70R16 LTX M/S2
cool.gif
 
Back when I was age 10 or so, I noticed the back tire was a little low on my BMX bike. So I stopped at a gas station and filled it, well over filled it.

When I sat on the seat, BOOOM!!!!!!!!!!!!

Sounded like a shotgun blast.

Never made that mistake again.
 
Originally Posted By: kr_bitog
Well, this is the Michelin recommendation.

Michelin LTX inflation

If your hot pressure increase still below 7 psi, I think it is OK to maintain on 35 psi even though you may not like the S-tyre handling characteristic and do not put much load in the car or bite the bullet get the 225/70R16 LTX M/S2
cool.gif



That's Funny and further strengthens my argument that the Tire Industry has not even begun to know what to do with tires, "Yet".

So I made about 5 calls to local Tire Retailers in my area...
And they would love to sell me a set.
Further, Even TireRack would love to sell me a set also:
http://www.tirerack.com/tires/TireSearch...amp;tireIndex=0

On your second point though, I would caution you that a psi increase of 7 psi on a 100 mile trip without an ambient temperature increase is borderline under-inflated.

Third Point... Even at Michelin's amended load rating of 1554 lbs for my tire, I am still operating within that limit.
You see, I had the van weighed yesterday.
Fully loaded, without me in it, it weighs 5180 lbs.

Last Point... I love the Tire, Michelin LTX MS P215/70R16, Love the ride, Love the fact that now that I have it dialed in, It will last me well over 75,000 miles.

Thanks for your thoughts, Jim
 
Originally Posted By: wrcsixeight
Back when I was age 10 or so, I noticed the back tire was a little low on my BMX bike. So I stopped at a gas station and filled it, well over filled it.

When I sat on the seat, BOOOM!!!!!!!!!!!!

Sounded like a shotgun blast.

Never made that mistake again.


Yes Sir,

The Gas Station air filling hose can be sudden death for a bicycle tire.

Thanks for Sharing, Jim
 
Originally Posted By: AstroTurf
Originally Posted By: kr_bitog
Well, this is the Michelin recommendation.

Michelin LTX inflation

If your hot pressure increase still below 7 psi, I think it is OK to maintain on 35 psi even though you may not like the S-tyre handling characteristic and do not put much load in the car or bite the bullet get the 225/70R16 LTX M/S2
cool.gif



That's Funny and further strengthens my argument that the Tire Industry has not even begun to know what to do with tires, "Yet".

So I made about 5 calls to local Tire Retailers in my area...
And they would love to sell me a set.
Further, Even TireRack would love to sell me a set also:
http://www.tirerack.com/tires/TireSearch...amp;tireIndex=0

On your second point though, I would caution you that a psi increase of 7 psi on a 100 mile trip without an ambient temperature increase is borderline under-inflated.

Third Point... Even at Michelin's amended load rating of 1554 lbs for my tire, I am still operating within that limit.
You see, I had the van weighed yesterday.
Fully loaded, without me in it, it weighs 5180 lbs.

Last Point... I love the Tire, Michelin LTX MS P215/70R16, Love the ride, Love the fact that now that I have it dialed in, It will last me well over 75,000 miles.

Thanks for your thoughts, Jim


Don't worry Jim, if the tyre sidewall is marked with 1709 lbs for max load you are fine, most likely michelin never update the website since they are selling LTX M/S2 nowadays. However I will still not pump it beyond the sidewall marking to reduce the risk of blowout when I accidentally hit potholes on high speed. Of course when the tyre is rated H or V, this risk is lowered compared than S.

BTW, the hot pressure increase is depending more on your driving speed rather than the distance you travel, generally 20-30 miles high speed driving is enough to stabilize the hot pressure. It is true 7 psi is borderline underinflate, typically 4 psi or less is the target, to keep the performance gap small on wet and dry roads

Anyway LTX M/S is guaranteed for 60.000 miles, I will not put much hope that will last longer than that even though it is possible if you always drive slowly on smooth road with low load. My Pilot Sports 3 may just last nicely in 20000 mile and warrant a change to maintain the aquaplanning resistance.
 
you need to worry about wheel durability when over-inflating tires considering the hoop stresses from the weight of the vehicle hanging on the upper section of the tire. Wheels sometimes get derated for load carrying capacity as pressures are increased.
 
Originally Posted By: BBDartCA
you need to worry about wheel durability when over-inflating tires considering the hoop stresses from the weight of the vehicle hanging on the upper section of the tire. Wheels sometimes get derated for load carrying capacity as pressures are increased.


Great Point, Thanks

We should add... High Pressure Valve Stems also.

Thanks again, Jim
 
Astroturf,
you really should google your alias/hero, and see if you also advocate street racing booked over internet forums, queries to physics (of all types of) forums regarding how many turns of a tyre occur in a mile, and asking for used specifically sized tyre in any condition, presumably for his paying customers..before deciding that the rest of us are wrong.
 
Originally Posted By: Shannow
Astroturf,
you really should google your alias/hero, and see if you also advocate street racing booked over internet forums, queries to physics (of all types of) forums regarding how many turns of a tyre occur in a mile, and asking for used specifically sized tyre in any condition, presumably for his paying customers..before deciding that the rest of us are wrong.


Shannow,

Not sure that I follow what you are saying.

I am just reflecting what I have found and am doing.

I do not advocate street racing in any way shape or form.

Just My Hyper-Inflation Story... What's Yours?

Have a good one, Jim
 
Originally Posted By: kr_bitog
Yes, the mythbuster show exactly why the temperature scan on tread is important to help determine best inflation for specific application for particular tire


I have been looking at pyrometers online, and looked at an IR Thermometer yesterday. I will have one... One Day.

What are your experiences with them? What's Your Story?

Thanks, Jim
 
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