Tire pressure

[Frederick]

I"m getting different info on tire pressure installed new 12 ply 235/16/80R they came home with 90 lbs was then told they should hve 110 lbs google info says 95 lbs I put 92 lbs in them for my sturgis SD trip any ideas on this

[Tbos]

If the sidewall says 110 run 110 cold. Most have found if the wheels are rated to max tire pressure running at max is best for load capacity and performance.

[ctbruce]

X2^^. TBOS nailed this one.
Run your tires at the max stamped on the sidewall.

[JRTJH]

Load Range F (12 ply rating) tires are rated at maximum capacity at 95 PSI.
Load Range G (14 ply rating) tires are rated at maximum capacity at 110 PSI.

You indicate your tires are 12 ply tires, so the 110 PSI should not enter the picture.

What brand, size tires did you buy? Given that information, every manufacturer has a specifications chart for their ST tire lines which gives the maximum pressure/load information.

You can find the Carlisle Radial Trail HD information at this link: https://www.carlislebrandtires.com/o...adial-trail-hd

Carlisle's 12 ply tire only comes in one size and is the last entry at the bottom of the chart. If you have a competitor's tires, they "should" follow very closely with the pressure/load ratings, but may differ, so check your specific brand to confirm.

[flybouy]

Originally Posted by JRTJH

Load Range F (12 ply rating) tires are rated at maximum capacity at 95 PSI.
Load Range G (14 ply rating) tires are rated at maximum capacity at 110 PSI.

You indicate your tires are 12 ply tires, so the 110 PSI should not enter the picture.

What brand, size tires did you buy? Given that information, every manufacturer has a specifications chart for their ST tire lines which gives the maximum pressure/load information.

You can find the Carlisle Radial Trail HD information at this link: https://www.carlislebrandtires.com/o...adial-trail-hd


Carlisle's 12 ply tire only comes in one size and is the last entry at the bottom of the chart. If you have a competitor's tires, they "should" follow very closely with the pressure/load ratings, but may differ, so check your specific brand to confirm.

Find it interesting that the table lists the max load at 10 m.p.h. and the max speed ratingings at up to 81 m.p.h. depending on tire. I would love to see a graph with load rating vs speed rating to see where the load rating is at highway speeds.

[JRTJH]

Originally Posted by flybouy

Find it interesting that the table lists the max load at 10 m.p.h. and the max speed ratingings at up to 81 m.p.h. depending on tire. I would love to see a graph with load rating vs speed rating to see where the load rating is at highway speeds.

Yeah, I saw that too, scratched my head, wondered if it was a misprint or some strange way of measuring/testing max load ratings, turned the page and completely forgot about it. Something to be said for "old age short term memory retention"....

While I can't explain it, it doesn't reach high enough on my "gotta know index" to do the research. Maybe this winter while we're snowed in, I'll open that webpage again and it'll then be "long term memory" ??? If you happen to ask Carlisle what it's all about, please share...

[flybouy]

Originally Posted by JRTJH

Yeah, I saw that too, scratched my head, wondered if it was a misprint or some strange way of measuring/testing max load ratings, turned the page and completely forgot about it. Something to be said for "old age short term memory retention"....

While I can't explain it, it doesn't reach high enough on my "gotta know index" to do the research. Maybe this winter while we're snowed in, I'll open that webpage again and it'll then be "long term memory" ??? If you happen to ask Carlisle what it's all about, please share...

Ask Carlisle what?
CRS is a terrible condition!

[JRTJH]

Originally Posted by flybouy

Ask Carlisle what?
CRS is a terrible condition!

Carlisle? Who is he? CRS? Is that a military organization? Component Repair Squadron?

[Javi]

Make sure that your wheels are rated for the sidewall pressure... My 16" wheels are only rated for 80 pounds...

[GHen]

I have always wondered about cold compared to hot pressure, especially during our hot summers. If it says 110 cold, then how much is too much when hot? 115, 120.... I have the same question on my Tow vehicle. Once every hour or two I check tires and wheel temperature with an infrared temperature sensor to confirm they are consistent and I watch my TV pressure on my dash. They climb about 5 pounds when warmed up. When checking my rv tire pressures, I see about 5 pounds more also. I have not driven in 90 degree plus temperatures so I’m not sure how much more they will climb. When should I be concerned?

[ctbruce]

Originally Posted by GHen

I have always wondered about cold compared to hot pressure, especially during our hot summers. If it says 110 cold, then how much is too much when hot? 115, 120.... I have the same question on my Tow vehicle. Once every hour or two I check tires and wheel temperature with an infrared temperature sensor to confirm they are consistent and I watch my TV pressure on my dash. They climb about 5 pounds when warmed up. When checking my rv tire pressures, I see about 5 pounds more also. I have not driven in 90 degree plus temperatures so I’m not sure how much more they will climb. When should I be concerned?

You set your tires at the max COLD temp. They are designed to handle the increase after heating up. Otherwise you'd have to stop A LOT to make minor adjustments in pressure. That would be no joy in my book.

[JRTJH]

^^^ what Chip said.... To think that engineers "didn't consider heat/pressure gain" when designing a tire is to believe that "kindergarten concepts" were ignored. It's basic engineering at work to build in the anticipated heat/pressure rise when designing any product. While it may have happened "one time with one tire design" to believe that every tire built has "failed the concept" just won't fly....

The tire manufacturers are way ahead of your concern about "what if" and have built the tires to accommodate the anticipated pressure rise. In almost every "tire maintenance FAQ" you'll read the statement: "Do not bleed tire pressure from your tires while they are hot"......

[NorskeBob]

In load range E run 80 psi in load range G run 110# - all cold pressure. Keystone was cheap and put a load range E on as the spare - the 4 on the RV are load range G. The pressures will vary with outside air temp. So - I check the pressures prior to each trip.

Run the tow vehicle at the pressures as recommended - "door" sticker for our truck.

[5J's]

Run the tow vehicle at the pressures as recommended - "door" sticker for our truck.[/QUOTE]

This is only true if you are running the tire size that is also printed on the sticker. [emoji6]

[Fishsizzle]

I’ll wade into this a little. I worked at Schwabies many moons ago.

Tow vehicle: to get the ratings on the door, that is cargo or towing, you must inflate the tires to the pressure listed. I run my tires much lower when I’m not towing or carrying cargo. I’ve seen more than a few tires with centers worn out from running them up without a load on them

My trailers are always loaded, or will be for half a trip. So These are always at the max.

And I check Truck and Trailer every time I hook up. Carry a small compressor to top off if needed.

[Local150]

What do you guys think of nitrogen in the tires ?

[JRTJH]

Originally Posted by Local150

What do you guys think of nitrogen in the tires ?

ALL tires are "naturally equipped" with 78% nitrogen. Adding the other 22% is optional at extra cost. Is it worth it? depends on which side of the fence you sit on or which side of the bed you got out of this morning....

In other words, at least to me, not worth the hassles or expense for the minimal benefits achieved. Now if we towed at 200+ MPH, or at 40K ft altitudes.....or in sub zero temperatures and in highly explosive atmospheres..... Otherwise, Nah, not worth it. YMMV

[travelin texans]

Originally Posted by JRTJH

ALL tires are "naturally equipped" with 78% nitrogen. Adding the other 22% is optional at extra cost. Is it worth it? depends on which side of the fence you sit on or which side of the bed you got out of this morning....

In other words, at least to me, not worth the hassles or expense for the minimal benefits achieved. Now if we towed at 200+ MPH, or at 40K ft altitudes.....or in sub zero temperatures and in highly explosive atmospheres..... Otherwise, Nah, not worth it. YMMV

Yea! What he said.....

[Old Mustanger]

Originally Posted by JRTJH

ALL tires are "naturally equipped" with 78% nitrogen. Adding the other 22% is optional at extra cost. Is it worth it? depends on which side of the fence you sit on or which side of the bed you got out of this morning....

In other words, at least to me, not worth the hassles or expense for the minimal benefits achieved. Now if we towed at 200+ MPH, or at 40K ft altitudes.....or in sub zero temperatures and in highly explosive atmospheres..... Otherwise, Nah, not worth it. YMMV

I guess this would be X3 to this

[madmaxmutt]

Originally Posted by Local150

What do you guys think of nitrogen in the tires ?

It is a pretty expensive way to get green valve caps.