Correct tire pressure

[JABURKHOLDER]

On my dually I run 80psi on the front and 75psi on the back.
On my rig (614's) I run 100psi. For my weight, I don't need more.


Concur with BB TX, higher psi than needed creates a harsher ride and creates less tire footprint on the road.


Just because your tires and rims say max 110psi doesn't mean your rig needs max.


That being said, better to error on the high end. The low end will give you a LOT more problems. JMHO

[Texan]

I have the Sailuns and my 3402 rl weighs 16,200 lbs loaded and i run mine at 110 psi.I have over 12,000 miles on the tires and they look to be wearing evenly. I do have the independent suspension but i would be more worried about tire heat build up than the ride. Having more tire to pavement contact sounds good but when you are turning, the less contact is better than more. There is a lot of stress on the tires and suspension when making sharp turns going forward or backwards.As for as wearing out your tires prematurely with more air, you will most likely have your tires time-out before they wear-out.More air means more safety margin when dealing with load capacity and these Montana's are pretty heavy. Why have a G rated tire if you are not going to take advantage of the increased load capacity.

[mlh]

Well said Texan especially the last sentence.
Lynwood

[Ram Montana High Country]

OK - lots of good input - my question is: NITROGEN fill - my Uncle has a bed camper, adds 3000 LBS to truck. His comment was, "Without Nitrogen, he'd pull into rest area and could not put his had on the tires comfortably. With Nitrogen he could"
Worth the money?

[mlh]

Worth the money? No.
Air is about 78% and that's good enough for me.
Lynwood

[phillyg]

Texan said, "Why have a G rated tire if you are not going to take advantage of the increased load capacity."

For the first time that I know of, we have a published psi chart for an ST tire. Perhaps that's because the Sailun G637 is a rebadged all position LT tire.

Previously we were well-advised to run cruddy ST tires at max psi because anything less could cause overheating and blowouts. Now, those FWs between 13-16,000lbs with G-rated Sailuns can be run at less than 110psi.

My FW is probably near the top end weightwise, so I'm starting at 110psi and I've not noticed any difference in ride. I need to get weighed and I'm going to moniter tread depth. If greater in the middle I'll start going down in psi, but no lower than the chart spec.

[phillyg]

Originally Posted by Ram Montana High Country

OK - lots of good input - my question is: NITROGEN fill - my Uncle has a bed camper, adds 3000 LBS to truck. His comment was, "Without Nitrogen, he'd pull into rest area and could not put his had on the tires comfortably. With Nitrogen he could"
Worth the money?

I'm thinking it's more likely his truck was overloaded with the camper, and without using a temperature gauge, it's difficult to know the real temp. Air is 78% nitrogen and I believe it's only recommended as a marketing ploy.

[Texan]

Weighing your rig will cut out the guessing.I've never heard anyone have problem with there tires running maxium pressure but running low can and will create build-up of heat which is poison to your tires. If a person never wears out there tires then it would probably be wise to keep the maxium pressure for the cooler running and i believe it would more than compensate for the rougher ride. I put about 5 to 6 thousand miles a year on my rig so my tires will most likely time out before they wear out. As hard as the rubber is on the sailuns i could easily see someone getting 40 to 50 thousand miles on there tires if they don't time-out first. ' COOL IS BETTER' especially in the summer.

[CaptnJohn]

Here is the email I received from Sailun today. I plan to run them at 100PSI.




John, thank you for being a Sailun customer. Inregards to your inquiry, I am assuming the weight you provided was fully loadedand that you have two axles (4 tires).


The math works out to 3500 lbs./tire. I have attachedthe load and inflation table for ST tires. You will see that at 80 psi,the tire will carry 3640 lbs./tire. So, you can go as low as 80psi. If you want to build some safety in, you can run your tires at 85 or90 psi. The issue with putting too much air is you will find your trailermay “bounce” a little going down the road. You may have to experiment alittle to find the optimal pressure.





You will see the chart only shows up to a 10 ply (“E”) ratedtire. For each 5 psi increase in air pressure, you can carry anadditional 120 lbs. of weight/tire. up to 110 psi.





Hope this helps. Safe travels.





Al Eagleson‘ACE’


Director, Commercial TruckProducts

[rohrmann]

Phillyg, I think you are mistaken about the Sailun tires, actually S637. If you look at the product sheet, the two 16" sizes have a little '*' next to the part code, and the note indicates that, "All steel construction specifically designed for Trailer application only. Requires special high load capacity wheel. Consult wheel manufacturer for proper application", so these tires, just like the Goodyear G614, are only to be used for trailer applications

http://www.sailuntires.ca/MRT/S637.html

These tires were always intended to be used as a trailer tire, never were all position.

[phillyg]

Originally Posted by rohrmann

Phillyg, I think you are mistaken about the Sailun tires, actually S637. If you look at the product sheet...... these tires, just like the Goodyear G614, are only to be used for trailer applications......
http://www.sailuntires.ca/MRT/S637.html

Yep, typo or brainfart about the "S" v. "G." OTOH, I had to go back in time about the Sailuns only being used for trailer applications, and could not find the specific reference I was looking for. It was a govt. document about some Chinese mfgrs. "rebranding" tires to get around the 2009 Obama administration decision to put a 35% import tariff on passenger and light truck tires.

There was some action in 2014 from US interests to exclude ST tires from the tariff (even though it was unclear to me that the 2009 tariffs ever involved ST tires). I think, but can't now disprove the asterisk in the Sailun product sheet. So, good catch on the asterisk.

[rohrmann]

The change from the Sailun's being LT tires to what they are now, ST, is the reason you mentioned, to dodge the import tariff on the tire being classed an LT. Still, when they were rated an LT tire, just like the Goodyear G614, which is still rated an LT tire, they both were always spec'd to be a trailer tire only.