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Topic: Toyo M177 correct PSI (Read 2208 times) previous topic - next topic

Re: Toyo M177 correct PSI

Reply #20 –
Quote from: bigdog –
I beg to differ Pierce. Some of the confusion stems from two differing sets of numbers from TOYO's own charts as shown in realmacoys picture. There is nothing in those two lines of numbers nor in the footnotes telling you that it's different due to the tire being made in Japan or elsewhere. The only footnote for that tire is that it is equivalent to the smaller Michelin 275/80R22.5.
If one isn't running a full load of 7160 @ 125psi per the side wall branding. Then which part of those two lines on TOYO's load chart is one supposed to use?  One "might" figure it out based on one having H and max 120psi and the other H and max 125psi. But again, It isn't explicitly clear in the chart. And that's a glaring error for such an important item.
Jerry,

I didn't say the tires were different depending on where they are made. I just said that the stamp on the tire, for example 146/143 , tells what the load capacity is anywhere in the world. Just like the L and M for speed rating. Nothing to do about where the tire is made.

The footnote means that you can mount the tire and the diameter will be the same as the 295/75. A different aspect ratio but the same diameter.

The tire shop I purchased our tire from listed both the G and H but when I asked him, he said he only imported the H rated tires as that was all the trucks and buses wanted. Same price for either rating.

I don't see it as a glaring error. Given a choice, I would add 5 psi. Tires don't gain cold pressure but they sure can lose pressure. Like the dealer told me, if you don't mind the ride, go up to 120 psi cold. Because of our light load, he just suggested 105 psi but nothing wrong with having them higher. With our G load Coopers, I always maxed them out at 110 psi all around.

On the fire dept, we checked pressures every week on service day and ran all pressures at the sidewall maximum. We didn't  have ride to consider, only the safety of the public. Firestone and Cooper were the suppliers and recommend the pressures for our emergency vehicles. The bus company I bought the Greyhound from always maxed their tires no matter how many passengers were aboard.

Pierce

Re: Toyo M177 correct PSI

Reply #21 –
Quote from: bigdog –
I beg to differ Pierce. Some of the confusion stems from two differing sets of numbers from TOYO's own charts as shown in realmacoys picture. There is nothing in those two lines of numbers nor in the footnotes telling you that it's different due to the tire being made in Japan or elsewhere. The only footnote for that tire is that it is equivalent to the smaller Michelin 275/80R22.5.
If one isn't running a full load of 7160 @ 125psi per the side wall branding. Then which part of those two lines on TOYO's load chart is one supposed to use?  One "might" figure it out based on one having H and max 120psi and the other H and max 125psi. But again, It isn't explicitly clear in the chart. And that's a glaring error for such an important item.

Exactly............
I have questioned why the Toyo chart for the LR-H rated 295/75/22.5 at a max of 7160 @125 psi starts at 95 lbs and the other one rated 6610@120psi starts at 70 lbs. on the chart.

Does this mean that the higher rated tire should not be ran at less than 95 psi regardless of the load?

 

Re: Toyo M177 correct PSI

Reply #22 –
Quote from: Pierce & Gaylie Stewart –
Jerry,

I didn't say the tires were different depending on where they are made.

I don't see it as a glaring error.

Pierce

I'll try and word it another way. When your H rated tire is loaded to less than the max load. Which H rated tire pressure guide does one use?
Not many people that drive coaches have the experience you or I have had working around the heavy fire equipment you have used or the class 8 semis I have owned.
 
So my issue with TOYO's chart is that it isn't presented in a way that the average coach owner who is not experienced with class 8 tires can understand.
Not many would simply say "I'll just add 5 psi" Hell, the majority of coach pilots don't check tire pressure nearly enough.
 
So any brands tire inflation guide for less than max loads should be very, very clear instead of a logic puzzle.  And TOYO's chart isn't as clear as it should be given the importance of proper tire inflation.

It wasn't clear to me or Elliott. I don't believe Elliott to be an unwise person. Although the jury is still deliberating on my status. :))

Re: Toyo M177 correct PSI

Reply #24 –
Quote from: Chuck Pearson –
According to Toyo, yes.  95 psi minimum.  They declined to provide any further info.


Whoops .....

I've been running 85 psi in the fronts now for 7,000 miles. 95 in the rears.

Front weight -  8840
Rear weight  - 18760

Re: Toyo M177 correct PSI

Reply #25 –
As did I .
My prior chart went to 70PSI for the H rated  fronts, I ran at 75 cold.  Drove poorly and cost .5 MPG.  I went back to 9R , OE size and now run the front at 94cold .  Steers much better, rides a tiny bit harder, may have picked up a little MPG. 
  Next year the H rated rears will have timed out and they will also be 9R, run at 92PSI . instaed of the current 85  on the H  tires. 

Re: Toyo M177 correct PSI

Reply #26 –
We need to be a little careful here, as there are comparisons between different tires and vastly different weight coaches.

Re: Toyo M177 correct PSI

Reply #27 –
Quote from: wolfe10 –
We need to be a little careful here, as there are comparisons between different tires and vastly different weight coaches.
And the odd thing is that Toyo's load/inflation chart only differentiates inflation data by tire size "FULL STOP" not the tire models within the same size range. 

So per the Toyo chart. My H rated M137's have the identical inflation schedule as Elliott's H rated M177's.

Re: Toyo M177 correct PSI

Reply #28 –
Quote from: bigdog –
And the odd thing is that Toyo's load/inflation chart only differentiates inflation data by tire size "FULL STOP" not the tire models within the same size range. 

So per the Toyo chart. My H rated M137's have the identical inflation schedule as Elliott's H rated M177's.


One might assume that the load rating for a steer tire and an all position tire may be at least slightly different, as would a drive tire.
 

Re: Toyo M177 correct PSI

Reply #29 –
Quote from: FourTravelers –

One might assume that the load rating for a steer tire and an all position tire may be at least slightly different, as would a drive tire.
 

I kind of get it that as most of the class 8 OTR style truck tires generally carry the same weight given DOT weight regs. That all within the same size range would be built to that requirement.
 
My beef all along has been that in the Toyo chart. Toyo combined two different H rated carcasses. one rated to 120psi and one 125psi then also added in the G rated carcass for good measure.
Which of course creates a possible point of confusion in just what pressure ones H rated tire should be using as three differing carcass builds and two load ratings are combined into two lines.

All this could have been made very clear to the end user by adding ONE additional line to separate the three carcass builds for the 295/75R22.5 that Toyo makes. 

Re: Toyo M177 correct PSI

Reply #30 –
Quote from: bigdog –

My beef all along has been that in the Toyo chart. Toyo combined two different H rated carcasses. one rated to 120psi and one 125psi then also added in the G rated carcass for good measure.


Yes, and they also added the "F" rating in the same line on the 120 psi tire.

 

Re: Toyo M177 correct PSI

Reply #31 –
Quote from: FourTravelers –

Yes, and they also added the "F" rating in the same line on the 120 psi tire.


Good Lord almighty Justin!! Well there you go.

I've seen that chart many, many times and that escaped me. Which shows that Toyo chart is utter rubbish and can easily mislead folks to the incorrect inflation values. That's actually kind of scary.