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

Toyo M177 correct PSI

Tires are 295/75R22.5

Front axle weight: 13200lbs
Rear axle weight: 20960lbs

Can someone confirm I'm interpreting the chart correctly by setting my rear tires at 85psi and front at 110?

Re: Toyo M177 correct PSI

Reply #1 –
Are your tires Load G or H? Your tires are at 6600 lbs in the front (Single) and 5250 lb in the back (Dual).  That size tire doesn't show a load H, and therefore you're overloaded at 110 psi (max pressure for tire) and the rear should be 100 psi (which seems high...).

https://coopertrucktires.com/CooperRoadmaster/media/Documents/Load-inflation-table.pdf here's a different chart with similar values that includes Load H tires for that size.

Re: Toyo M177 correct PSI

Reply #2 –
Quote from: Zach –
Are your tires Load G or H? Your tires are at 6600 lbs in the front (Single) and 5250 lb in the back (Dual).  That size tire doesn't show a load H, and therefore you're overloaded at 110 psi (max pressure for tire) and the rear should be 100 psi (which seems high...)..
They are load H, maxed out at 7160lbs @ 125psi on a single axle.

Re: Toyo M177 correct PSI

Reply #4 –
I have Toyo 177 LR H I run 120 in the front, 100 on the rear. Might be a bit high, but I'll take a little high.
Why would you be looking at a Cooper chart when you have Toyo tires?

Re: Toyo M177 correct PSI

Reply #5 –
This is the load chart I have for my Toyo 177s

Re: Toyo M177 correct PSI

Reply #6 –
Second try

Re: Toyo M177 correct PSI

Reply #7 –
Quote from: bbeane –
I have Toyo 177 LR H I run 120 in the front, 100 on the rear. Might be a bit high, but I'll take a little high.
Why would you be looking at a Cooper chart when you have Toyo tires?

The toyo chart listed and a quick google search did not include load h tires. The cooper tire (the tires I have) have the same values listed on each graph.

Re: Toyo M177 correct PSI

Reply #8 –
I have the Toyo M170 load range H (295/75/22.5)
Not sure why there are two different ratings for  the same size and load range.

One has a max press of 120psi, the other has a max press of 125 and a higher load rating  ???

Re: Toyo M177 correct PSI

Reply #9 –
Per the TOYO chart. looks like 115 for a 6600lbs single front. 95 for dual loaded at 5240 per tire on the rear.

LOAD AND INFLATION TABLES
                                    psi  70      75    80    85    90    95        100  105  110        115    120
295/75R22.5*** Dual lbs. 4095 4300 4540 4690 4885 5070(F) 5260 5440 5675(G) 5795 6005(H) - -
                              Single 4500 4725 4940 5155 5370 5510(F) 5780 5980 6175(G) 6370 6610(H) - -
                                    psi            95    100  105  110    115  120  125
295/75R22.5*** Dual lbs. - - - - - 5305 5530 5750 5965 6185 6400 6610(H) -
                              Single - - - - - 5750 5990 6230 6465 6700 6930 7160(H)

Re: Toyo M177 correct PSI

Reply #10 –
My 2cents.  90 in the rear and 115 in the front.  Ive tried lower but not higher and couldn't tell any difference in ride or fuel mileage.  Ive tried 80 in the rear and 105 in the front.  It just didnt feel right running that  low even though Id be fine with my coach.  On my Harley I always run the tire max psi.  On my truck and car I try and run max as long as the tire still rolls flat and not concave or convex

Re: Toyo M177 correct PSI

Reply #11 –
I run Front @  110lbs (Cold)  --- Rears @  95 to 100lbs (Cold)    so far so good....  as they warm up the pressure goes up....  ^.^d   

Re: Toyo M177 correct PSI

Reply #12 –
Quote from: Gerry Vicha –
I run Front @  110lbs (Cold)  --- Rears @  95 to 100lbs (Cold)    so far so good....  as they warm up the pressure goes up....  ^.^d   
I run the TOYO M137 H ply as they don't have such deep tread. So don't squirm as much. I run 100psi in the front and rear. As I run a TPMS and see the psi & temps. On a hot day on the interstate. I have never seen the temp go over 100-105 on a hot tire nor has the psi gone up more than 10-15 psi from cold to hot. So well within limits.

Re: Toyo M177 correct PSI

Reply #13 –
There are two different versions of the M177 in load range H.  The tires made in Japan have higher load and pressure rating than the ones not made in Japan.  You can determine which you have by examining the tire's origin stamp.  That's why the Toyo load chart shows different values for what looks to be the same tire.

I confirmed this in discussion with Toyo.

Re: Toyo M177 correct PSI

Reply #14 –
Quote from: Chuck Pearson –
There are two different versions of the M177 in load range H.  The tires made in Japan have higher load and pressure rating than the ones not made in Japan.  You can determine which you have by examining the tire's origin stamp.  That's why the Toyo load chart shows different values for what looks to be the same tire.

I confirmed this in discussion with Toyo.
Oy Vey! would be nice if TOYO made that abundantly clear in their brochures and load charts. My TOYO dealer said zilch about this when I bought TOYO's.

Re: Toyo M177 correct PSI

Reply #15 –
My dealer was clueless as well.  I figured it out after the fact and found I have the Japanese version.  Was expecting it to be the same spec as the Michelins they replaced, as advertised by Toyo...but the minimum pressure is 25 psi or so above Michelin.  ended up airing em up to the chart. 
After an extended break in very impressed with driving characteristics, like em more than Mich, better directional stability.  Rides like a log cart tho with my light coach and high pressure. 

Re: Toyo M177 correct PSI

Reply #16 –
You don't need a dealer to tell you what the load rating is for your tire whether in Asia, Europe or the U.S. Just go to the twin numbers on the side of the tire, you can see exactly what the tire capacity is for your tire with the single tire and double/dual tire rating. This is only good at the tire's maximum placarded pressure NOT the manufacturer's recommended pressure. So, no matter what the dealer tells you the tire is rated for, just look at the online tire specs. It will have the load index rating, at the maximum pressure and also the speed rating. Remember L is 75 mph and M is 81 mph.

In the attached photo of our tires, you can see the load index is 146/143 with M (81mph) for the speed rating and 120 psi for the pressure at the 146/143 maximum weight. Going to the attached load rating chart, you can see that the single tire maximum weight is 6614 lbs and if mounted on the rear as a dual, it's 6008 lbs with both ratings at 120 psi. If you reduce the pressure, you no longer have the load index rating as shown on the tire. You also lose the speed rating.

Don't ask me why there is a 2 or 3 lb difference between the actual tire and the chart.

As we are don't full time (not many tools, goods, etc), are 36 feet and because of our mountain location, almost empty tanks, we are pretty light and way under the 12,028 front axle tire load so we reduce all the tires to 105 psi. Weigh your coach and compare to the chart.

Note that some H rated tires may have a 149/146 load rating so check before buying.

Once again, if you have a 6610 lb rated tire, that's only good at the 120 psi as shown in the attachment. Less pressure and the load drops and the tire temperature increases. These are COLD pressures so will increase as you drive and should NEVER be lowered during the day.

Pierce

Re: Toyo M177 correct PSI

Reply #17 –
Elliott,
My tires were made in Japan so I use the second chart. Carrying a few more pounds than the Goodyear or Michelin but they have been great so far. I only have 6,000 miles on them. My tire dealer actually inflated them according to the chart and I saw them torquing the lugs with a torque wrench.

When I pull onto the highway after driving on gravel I hear small pieces of gravel hitting wheel wells for a half mile or so.

Re: Toyo M177 correct PSI

Reply #18 –
My 177s are made in Japan, 5 years old 70k on them. Doing great! Another year on the front, 2 years more on the rear. Will go back with Toyos.

Re: Toyo M177 correct PSI

Reply #19 –
Quote from: Pierce & Gaylie Stewart –
You don't need a dealer to tell you what the load rating is for your tire whether in Asia, Europe or the U.S. Just go to the twin numbers on the side of the tire, you can see exactly what the tire capacity is for your tire with the single tire and double/dual tire rating. This is only good at the tire's maximum placarded pressure NOT the manufacturer's recommended pressure. So, no matter what the dealer tells you the tire is rated for, just look at the online tire specs. It will have the load index rating, at the maximum pressure and also the speed rating. Remember L is 75 mph and M is 81 mph.

In the attached photo of our tires, you can see the load index is 146/143 with M (81mph) for the speed rating and 120 psi for the pressure at the 146/143 maximum weight. Going to the attached load rating chart, you can see that the single tire maximum weight is 6614 lbs and if mounted on the rear as a dual, it's 6008 lbs with both ratings at 120 psi. If you reduce the pressure, you no longer have the load index rating as shown on the tire. You also lose the speed rating.

Don't ask me why there is a 2 or 3 lb difference between the actual tire and the chart.

As we are don't full time (not many tools, goods, etc), are 36 feet and because of our mountain location, almost empty tanks, we are pretty light and way under the 12,028 front axle tire load so we reduce all the tires to 105 psi. Weigh your coach and compare to the chart.

Note that some H rated tires may have a 149/146 load rating so check before buying.

Once again, if you have a 6610 lb rated tire, that's only good at the 120 psi as shown in the attachment. Less pressure and the load drops and the tire temperature increases. These are COLD pressures so will increase as you drive and should NEVER be lowered during the day.

Pierce


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.