Tire pressure side wall -95 psi running 80 ok?

[Hurk]

Original tires were 235-80-16 had dealer replace when I bought. I wanted same size Salin st tires but he put on 235-85-16 different China make. These tires call for 95 psi max on sidewall. Original tires call for 80 psi and rims are only rated for 80 psi or 3100 lbs weight. Went to Kal Tire to get steal valve stems they confirmed rim rated for 80 psi. They said it would be fine to lower psi on tire to 80 from 95? I did this and tire looks fine no squatting. I'm mounting my TPMS I'll keep eye on them. I'm assuming they are ok dropping to 80. At that psi they can handle 3200 lbs.

[MtnTrek]

Shame you didn't get the requested Sailuns, Oh well.
And your trailer actually weighs how much?
Perhaps there's a CAT scale roll over in your future. Not really enough info. for an accurate recommendation.
If the Kal Tire tech wasn't alarmed, no reason for us to be. Nothing should have changed the rating of your existing rims though.

Enjoy.

[bddadles]

I don't really see a problem lowering the tire pressure to 80. 95 is what you could run with the tire but if the rim is only 80 max don't exceed that.

Brad

[FastEagle]

Originally Posted by Hurk

Original tires were 235-80-16 had dealer replace when I bought. I wanted same size Salin st tires but he put on 235-85-16 different China make. These tires call for 95 psi max on sidewall. Original tires call for 80 psi and rims are only rated for 80 psi or 3100 lbs weight. Went to Kal Tire to get steal valve stems they confirmed rim rated for 80 psi. They said it would be fine to lower psi on tire to 80 from 95? I did this and tire looks fine no squatting. I'm mounting my TPMS I'll keep eye on them. I'm assuming they are ok dropping to 80. At that psi they can handle 3200 lbs. (I'm thinking 3640# @ 80 PSI).

Are those replacements ST235/85R16F? If so, see green above.

A lot of OEM wheels for ST235/80R16E tires are certified for 3580# @ 80 psi. A quick check with the wheel manufacturer will get you the specs.

[Cliffy]

What does your rig weigh loaded? How many tires are supporting that weight?
Divide it out a see if your tires are up to the load. What is the load rating at 95 psi?
I found on my D rated STs that lowering pressure 10 psi caused heating of the sidewall/tread interface and failure happened. Even though, like you say, they looked fine inflated that way.

[jtbuilds]

Originally Posted by MtnTrek

Shame you didn't get the requested Sailuns, Oh well.
And your trailer actually weighs how much?
Perhaps there's a CAT scale roll over in your future. Not really enough info. for an accurate recommendation.
If the Kal Tire tech wasn't alarmed, no reason for us to be. Nothing should have changed the rating of your existing rims though.

Enjoy.

I agree.......and who ever put the not Sailun tires on on should give you a pressure load chart so you can run the correct pressure/load.

[jelag]

so under federal guidelines, LT tires have to list a max pressure with a load rating... its common on LT tires to use less than max pressure if you have the tire manufacturer factory chart with what it recommends based on load.. I personally carry a Harbor Freight point and shoot, infra-red premature gauge... when I stop at any rest area I walk the truck and trailer looking at tire, hub and brake drum temperatures.. tires never exceed 150*F and I often see the sun side 10*F higher.. hubs on the trailer are never over 110*F and I often see 300-400* F on the brake drums if I brake hard going into the rest stop.. if I coast in... usually under 150*F..

Anything over those base numbers and I start to look for something that's not right...

[FastEagle]

Originally Posted by jelag

so under federal guidelines, LT tires have to list a max pressure with a load rating... its common on LT tires to use less than max pressure if you have the tire manufacturer factory chart with what it recommends based on load.. I personally carry a Harbor Freight point and shoot, infra-red premature gauge... when I stop at any rest area I walk the truck and trailer looking at tire, hub and brake drum temperatures.. tires never exceed 150*F and I often see the sun side 10*F higher.. hubs on the trailer are never over 110*F and I often see 300-400* F on the brake drums if I brake hard going into the rest stop.. if I coast in... usually under 150*F..

Anything over those base numbers and I start to look for something that's not right...

The 300-400 hub temps after hard breaking will dissipate into the wheel/tire assembly. So when finding that high temp it would be wise to check the wheel/tire assembly a few times before leaving the area to see how much of the hi temp was transferred there.

[monkey]

As said above, weigh your rig axle by axle and then get the load chart from the tire manuf. I did this on our class A with Coopers, (16") and got a better ride with a little less than the 80PSI max. I do this now with our 5vr with Maxxis tires. (although I stay close to max) Again as said, you need to be careful of underinflation, a very bad thing... The company I work for runs 95PSI instead of 110PSI in big truck tires.
Monkey

[FastEagle]

Originally Posted by monkey

As said above, weigh your rig axle by axle and then get the load chart from the tire manuf. I did this on our class A with Coopers, (16") and got a better ride with a little less than the 80PSI max. I do this now with our 5vr with Maxxis tires. (although I stay close to max) Again as said, you need to be careful of underinflation, a very bad thing... The company I work for runs 95PSI instead of 110PSI in big truck tires.
Monkey

I know this to be a fact, but, most people will want to hear it from a person of authority.

Call or email any MAXXIS area rep and ask about your way of setting your tire pressures. The MAXXIS person will tell you to air them to the vehicle manufacturer's recommendations.

[ralphie]

Unfortunately, you're limited to max 80psi because of your wheels. OTOH, that's all you had to begin with and I would hope that's adequate for your weight. Getting each wheel weighed and using an inflation chart should provide peace of mind.

[Hurk]

I went to price out Sailun s637 ST235-80-16g 14 ply tires 110 psi max sidewall rating for 4000 lbs for single tire. I really want the Sailuns but the 110 rating scares me off. My tire is only rated for 80psi I don't believe I can lower from 110 to 80 even if 80 would carry my tire weight. I can't find a tire load Pressure chart for Sailun tires. I have a call into Sailun tech waiting their response. I haven't weighed my rig but I have 6,000 axels so I would think weight would be under 3,000 per wheel? GVW for 2009 30TS is 13,500 so 20% on hitch leaves approx 10,800 divided by 4 tires = 2,700. The Sailun at 80 psi would be lots for 3,000 but maybe to low for tires sidewalls?

[ralphie]

Originally Posted by Hurk

I went to price out Sailun s637 ST235-80-16g 14 ply tires 110 psi max sidewall rating for 4000 lbs for single tire. I really want the Sailuns but the 110 rating scares me off. My tire is only rated for 80psi I don't believe I can lower from 110 to 80 even if 80 would carry my tire weight. I can't find a tire load Pressure chart for Sailun tires. I have a call into Sailun tech waiting their response. I haven't weighed my rig but I have 6,000 axels so I would think weight would be under 3,000 per wheel? GVW for 2009 30TS is 13,500 so 20% on hitch leaves approx 10,800 divided by 4 tires = 2,700. The Sailun at 80 psi would be lots for 3,000 but maybe to low for tires sidewalls?

You can lower the psi for Sailuns. According to their chart, that tire will carry 3,420lbs at 80psi.

[Hurk]

Originally Posted by ralphie

You can lower the psi for Sailuns. According to their chart, that tire will carry 3,420lbs at 80psi.

Wow that's great news good job on finding the load chart. It's strange that it goes from 80 to 110 with no weights for lbs in between? I think I'm going do to get them installed tomorrow. Thanks again!