Community Forums

dperkinstx · 01-22-2023, 02:17 PM

In another thread, Senior Member jharrell posted, "I only run 95-100 psi as 120 psi is max for my tires and way to much for the weight on them based on Michelin charts, makes them ride horrible and wander..."

My TOYO tires (I not at my RV and don't have the size with me) call for 125 max psi. Should inflate them to 125 psi or should I put less air in them? Is there such a chart for TOYO tires?

Do you inflate your tires to Max PSI or do you inflate them to something lower?

twinboat · 01-22-2023, 02:29 PM

Without a chart, you inflate them to the Federal sticker in the RV.

It's always on the drivers side area, look for a yellow sticker.

alank · 01-22-2023, 02:31 PM

Quote:

Originally Posted by dperkinstx

In another thread, Senior Member jharrell posted, "I only run 95-100 psi as 120 psi is max for my tires and way to much for the weight on them based on Michelin charts, makes them ride horrible and wander..."

My TOYO tires (I not at my RV and don't have the size with me) call for 125 max psi. Should inflate them to 125 psi or should I put less air in them? Is there such a chart for TOYO tires?

Do you inflate your tires to Max PSI or do you inflate them to something lower?

Normally, something lower, according to the weight/pressure charts. Get your coach weighed, front & rear, then go by the charts.

Flyer15015 · 01-22-2023, 02:36 PM

OP,
If you would please fill out your signature line with the year, make, model of your rig, and add all the mod's you have done, you will get much better answers. Otherwise, we are just shooting in the dark.

Mike in Colorado

Old-Biscuit · 01-22-2023, 02:38 PM

Get your RV weighed then use the TOYO RV Tire Load Chart

https://www.toyotires.com/media/1475...ion_tables.pdf

NCC-1701A · 01-22-2023, 04:25 PM

Keep in mind that the charts show the MINIMUM required to support the load indicated in the chart. Roger Marble, a retired tire engineer, recommends adding 10% to that. Since going over a normal scale will only give you axle weights and not individual tire load this 10% is a cushion for side to side load differences. In addition, it saves you from adjusting tire pressures every morning it's colder ambient than when you initially filled them.

dperkinstx · 01-23-2023, 07:31 AM

Quote:

Originally Posted by alank

Normally, something lower, according to the weight/pressure charts. Get your coach weighed, front & rear, then go by the charts.

Where can I get my coach weighed? Is this a Loves/Flying J/TA type of thing? Or some other Big Rig type of repair place?

RangeMaggotBob · 01-23-2023, 07:37 AM

I have another question along this same line- they say to check/inflate your tires when they are cool. How much air are you supposed to add when you've been running a couple of hours and your tires are hot?

twinboat · 01-23-2023, 08:01 AM

Quote:

Originally Posted by RangeMaggotBob

I have another question along this same line- they say to check/inflate your tires when they are cool. How much air are you supposed to add when you've been running a couple of hours and your tires are hot?

None, unless you have a leak. In hat case get it fixed.

If you have no inflatator then you check them cold and calculate how much to add, let's say 10 psi, and then add 10 psi when you get to the inflator.

Camp CA · 01-23-2023, 08:06 AM

Trailer or motorhome? For a trailer, inflate them to the max cold tire pressure stated on the tire. For a motorhome, weigh the front and rear axles and with the tire manufacturer's inflation/load table adjust the inflation (psi) to match the weight each tire is carrying plus a safety margin.

burgmark · 01-23-2023, 08:16 AM

Quote:

Originally Posted by dperkinstx

Where can I get my coach weighed? Is this a Loves/Flying J/TA type of thing? Or some other Big Rig type of repair place?

I had mine weighed at a Love's that had a Cat scale with three platforms. I was able to get the front axle, rear axle and toad all in one weighing.

ftodaro · 01-23-2023, 07:35 PM

The process that i went through was to load my rig, pack it with the normal things, i take on a trip, fill the fuel tank full, and put the amount of water that i carry. Error on the side of more vs less. Then I took it to the cat scales and got my axle weights. Then I went to the inflation charts. There is some suggested formulas out there to compensate if you just have axle weights not not corner weights as well as giving your self a cushion. Always better to error on the side of more than you need than less than you need. I also bought a good digital tire gauge. If your going to do this, do it right and consistently. I generally run in inside duels about 2psi, lower (cold) than the outer tires They work harder due to the crown in the road and when hot they are about even.

Donskiman · 01-23-2023, 09:55 PM

I tend to think all this talk about getting your rig weighed isn't necessary. You can't possibly do that before every day of travel and weights vary depending on what you may use as you travel.

I go by the coach's weight rating per axle. That is the maximum amount of weight each axle is allowed. Then use the tire manufacturer's chart for inflation PSI.

burgmark · 01-24-2023, 06:42 AM

Quote:

Originally Posted by Donskiman

I tend to think all this talk about getting your rig weighed isn't necessary. You can't possibly do that before every day of travel and weights vary depending on what you may use as you travel.

I go by the coach's weight rating per axle. That is the maximum amount of weight each axle is allowed. Then use the tire manufacturer's chart for inflation PSI.

I emailed Michelin and here is an excerpt from their response:

"If a tire is used over-inflated to its load capacity, it can impact the safety of the product by reducing traction and will ultimately wear unevenly, greatly affecting the life of the tire. This will also affect the ride quality of the product by creating a rougher ride to the driver and passengers.

If a tire is used under-inflated to its load capacity, the product will gain excessive heat from the additional friction on the road surface. This greatly affects the over all integrity of the product and could shorten the life of the product exponentially.

As under-inflation has much greater impact on the safety of our consumers, we recommend that your air pressures be checked frequently and adjusted based on the load it is carrying. This may mean that your optimal pressures will change depending on the number of passengers, cargo, and fuel and water levels. We recommend our consumers to have their vehicles axle end weights acquired at the peak of the cargo level before each trip. If you are unsure of the correct pressure your load is requiring, we do recommend that you inflate the tires to the maximum cold pressure until you can acquire a proper reading of the weight and distribution of the load."

If you go by your maximum weight rating you could be over-inflating your tires for the load they carry. On the other hand, its possible someone might carry more weight then their axle rating and that therefore they could be under-inflated. My tires are capable of carrying more weight than my axle ratings, and although I don't recommend overweighting the axles, it is possible and it that case the tires need to be inflated to carry the actual weight.