Sailun

[PSFORD99]

Well I attempted to buy a new set of Sailuns , have yet to find a set thats any newer than just over a year old ,and that is the H rated . the G rated was over two years old . Got another local tire shop looking for a set ,would prefer local . Price is actually better locally than anything online . $177 ea.

Has anyone bought the newer H rated Sailuns ,and gotten a pretty new tire ,say 4-6 months old ? I'm afraid buying online might be the best option , seeing that the Sailun is not available at most tire stores .

 

[PSFORD99]

So , no one on this site has bought any Sailuns ????????? I've seen numerous threads on these tires ,but no-one has bought them ,or know how new a tire they are getting . I have tried to help numerous people on here buying Sailuns , but it seems I have had 90 views of this thread ,yet no-one can give me any idea how old a tire I am going to get ?????????????????????????

 

[Carl n Susan]

While I bought a 4 month old Sailun G off of Amazon late last year, there have been only a couple of members recently finding out about H's. It may take a day or two for them to answer your question.

 

[ChuckS]

One of the issues when purchasing RV tires is they often don’t move as quickly as auto tires do

I purchased my last set of Sailun S637 in size 235/85x16 fr9m our local Les Schwab tire center and at that time ( two years ago ) the date stamp on all four tires I bought showed they were about 5 months old

I can’t help you know with a current purchase .. but things like tire tariffs and such might be playing a factor

Also some folks opt for less expensive ST tires then a Sailun or Hercules and that probably affects how fresh the stock is at a wharehouse

A little insight from using ChatGPT …..
For Sailun S637 ST235/85R16 Trailer Tire (the common all-steel RV tire many fifth-wheel owners use), the typical manufacturing date when you buy them new is usually within about 3–12 months old, sometimes up to 18 monthsdepending on warehouse stock.

What most RV tire dealers consider “normal”

• 0–6 months old: Excellent / very fresh stock
• 6–12 months old: Very common when purchased new
• 12–18 months old: Still considered acceptable by most dealers
• Over 2 years old: Many RV owners will ask for a newer tire

Unlike automotive tires that move quickly, RV tires often sit longer in distribution warehouses, so seeing a tire that’s 8–12 months old is very typical when installed.

I checked with our local Les Schwab tire place in our small town and they can get the newer H rated Sailun tire as well..

 

[Mikendebbie]

I will apologize ahead of time for this question (unfortunately I have not been following the recent discussions on H rated Saliuns because I am 2 years from needing new tires hopefully)…

What is the “downside” of putting H rated tires on a Montana? Stiff ride?

 

[Carl n Susan]

I don't think there are many who have done it, yet. The H tires are rated for 120 P.S.I. which concerns most due to having 110 P.S.I. rated rims. But the consensus is to run whatever P.S.I. one used for the Gs (up to 110) when using the H.

 

[jsb5717]

I know that there is an age limit on these tires and they will age out before they wear out. But I'm just wondering if there is a difference between aging in a warehouse vs. aging in the elements? Or does age impact the integrity regardless?

 

[ChuckS]

Short answer: No — a Sailun S637 (or any tire) generally ages slower in a warehouse than when mounted on an RV, even if the RV tires are covered. But the difference depends a lot on storage conditions.

Here’s how it works.
1. Tires age even if they are never used

Rubber compounds slowly change over time due to oxygen, ozone, heat, and UV light. These cause oxidation and chemical changes that make rubber harder and less elastic.

So a tire does age in a warehouse, but the process can be slowed dramatically if the environment is controlled.

Typical guideline:

• 0–5 years: considered normal usable age
• 5–10 years: inspect carefully each year
• 10 years: most manufacturers recommend replacement regardless of tread

This applies whether the tire is used or stored.

2. Warehouse storage usually slows aging

A properly stored tire (like a new Sailun S637) typically sits in:

• Cool temperature
• No direct sunlight
• Low ozone exposure
• Minimal temperature swing

These conditions slow the chemical aging process.

Because of this, it is very common for new tires to be 6–24 months old when sold, and still considered “new”.

3. RV-mounted tires age faster even if covered

When installed on an RV, several additional factors accelerate aging:

Heat cycles

• Driving flexes and heats the tire carcass.

Internal oxygen

• Tires are inflated with air (~21% oxygen), which slowly oxidizes the rubber from inside.

Sun, ozone, and weather

• Even with covers, some UV and ozone exposure occurs

Static load

• RV tires often sit loaded in one spot for long periods

These conditions can accelerate aging compared with controlled storage.

4. A surprising RV reality

With RVs, age usually kills the tire before tread wear does.

Many RV tires fail with plenty of tread because UV, ozone, and time degrade the sidewalls.


Practical takeaway for your Sailun S637:

• A tire 2 years old in a warehouse may actually be in better condition than a 2-year-old tire mounted on an RV outdoors.
• The key number is the DOT date, not the installation date.

For RV owners (especially heavy trailer tires like the S637):

Most experienced RV techs recommend replacing around 5–7 years from the DOT manufacture date, even if tread looks good.

 

[RMcNeal]

Do the new H rated Sailuns have the 6 year warranty like my G rated ones did?

 

[ChuckS]

Warranty is 8 years

 

[RMcNeal]

Even better!

 

[PSFORD99]

Short answer: No — a Sailun S637 (or any tire) generally ages slower in a warehouse than when mounted on an RV, even if the RV tires are covered. But the difference depends a lot on storage conditions.

Here’s how it works.
1. Tires age even if they are never used

Rubber compounds slowly change over time due to oxygen, ozone, heat, and UV light. These cause oxidation and chemical changes that make rubber harder and less elastic.

So a tire does age in a warehouse, but the process can be slowed dramatically if the environment is controlled.

Typical guideline:

• 0–5 years: considered normal usable age
• 5–10 years: inspect carefully each year
• 10 years: most manufacturers recommend replacement regardless of tread

This applies whether the tire is used or stored.

2. Warehouse storage usually slows aging

A properly stored tire (like a new Sailun S637) typically sits in:

• Cool temperature
• No direct sunlight
• Low ozone exposure
• Minimal temperature swing

These conditions slow the chemical aging process.

Because of this, it is very common for new tires to be 6–24 months old when sold, and still considered “new”.

3. RV-mounted tires age faster even if covered

When installed on an RV, several additional factors accelerate aging:

Heat cycles

• Driving flexes and heats the tire carcass.

Internal oxygen

• Tires are inflated with air (~21% oxygen), which slowly oxidizes the rubber from inside.

Sun, ozone, and weather

• Even with covers, some UV and ozone exposure occurs

Static load

• RV tires often sit loaded in one spot for long periods

These conditions can accelerate aging compared with controlled storage.

4. A surprising RV reality

With RVs, age usually kills the tire before tread wear does.

Many RV tires fail with plenty of tread because UV, ozone, and time degrade the sidewalls.


Practical takeaway for your Sailun S637:

• A tire 2 years old in a warehouse may actually be in better condition than a 2-year-old tire mounted on an RV outdoors.
• The key number is the DOT date, not the installation date.

For RV owners (especially heavy trailer tires like the S637):

Most experienced RV techs recommend replacing around 5–7 years from the DOT manufacture date, even if tread looks good.

Thanks, good information . The newest Sailun tire I have found so far in the H rating is nearly 14 months old . So apparently these H's have been around for awhile . Finding G's they are over 2 years old the ones I seen , all from Big O . Best online price so far is Tire Easy ,and Walmart , for the H's .

I think I have already mentioned the last time I bought these Sailiuns in 2020. Anyway ordered a set from Simple tire ,older than I liked ,sent them back . Ordered another set from Walmart they were 6 months old , figured that was the best I was going to do . Will be ordering some H's from Walmart today, will see what happens . Says delivery tomorrow ,so look's like coming from somewhere locally .

 

[ND1C]

So , no one on this site has bought any Sailuns ????????? I've seen numerous threads on these tires ,but no-one has bought them ,or know how new a tire they are getting . I have tried to help numerous people on here buying Sailuns , but it seems I have had 90 views of this thread ,yet no-one can give me any idea how old a tire I am going to get ?????????????????????????

We got a new set from Home - Tredit Tire & Wheel We did not go to an H rated because we did not want to replace rims. But advised that if we changed to an 80 Series we gained 400lbs of load per tire in the same size for almost no difference in price. Check the date codes before you buy or order any tire. stay 90 days fresh, tires expire 5 years from the DOT date code even if not put into service

 

[imolaed]

I bought G rated from Walmart in November with a date code 2532 mid-August.
They mounted two at a time it took them an hour each

 

[ChuckS]

Email I received today regarding inquiry of the new Sailun S637T HD versus the original S637 series tire , date manufacture being seen in stores, load rating of tire at 95 psi cold, what’s considered a “New versus old tire” and ride harshness with the 16 ply series tire

 

[PSFORD99]

I bought G rated from Walmart in November with a date code 2532 mid-August.
They mounted two at a time it took them an hour each

Things are just not making sense here . You got a set of G's correct , that are approximately 8 months old . Big O has H's that are nearly 14 months old . Sailun website no longer lists a G rated available. Only thing I see that happened they were building both because you can't have 8 month old G ,and have H's that are 14 months old . Somewhere along the line they quit G's while they were making H's .

 

[WhatExit?]

Well I attempted to buy a new set of Sailuns , have yet to find a set thats any newer than just over a year old ,and that is the H rated . the G rated was over two years old . Got another local tire shop looking for a set ,would prefer local . Price is actually better locally than anything online . $177 ea.

Has anyone bought the newer H rated Sailuns ,and gotten a pretty new tire ,say 4-6 months old ? I'm afraid buying online might be the best option , seeing that the Sailun is not available at most tire stores .

This might be of help to you...

Tire replacement - new to me options ("DIY" to save $$$)

Knowing how important tire life/safety is especially here in the AZ heat, I decided to replace all 5 tires (4 + spare) on my 3120RL. I did my research and determined I'd stay with the Sailun tires. Sailun All Steel Radial Tire S637. Sailun G-Rated tires ST235/80R16G on the 16 x 6 rims. I...

www.montanaowners.com

 

[PSFORD99]

Email I received today regarding inquiry of the new Sailun S637T HD versus the original S637 series tire , date manufacture being seen in stores, load rating of tire at 95 psi cold, what’s considered a “New versus old tire” and ride harshness with the 16 ply series tire

Again ,great information , Thanks .

I just don't feel comfortable getting another brand of trailer tire , unlike my truck tires ,I have run several different brands ,can't say I have a favorite.

Thinking out loud here ,G Sailun's are more than adequate for my fifth wheel , being 15,500 GVWR , loaded right at 14,000 . The H's IMO are a bit of an overkill , but airing down is an option . I ran my G's 95 psi . According to my old Sailun weight chart that was good for 3970 , figuring 20% for pin weight , I got 11,200 on my axles or 2800 per tire , give or take depending on how the fifth wheel is loaded , but regardless I am more than covered on my tires at 95 psi.

They say the ride is going to be a bit more harsh with 16 ply at 95 psi. ? I guess 85 psi would improve the ride ,just wondering how a tire like that running that low of tire pressure , thats designed to run at 120 psi , will do . will it run hotter than it should ? I run the G's 15 lbs under there max psi. These H's will be running 25-35 under their max air pressure ,depending on what one choses to run like me .

 

[Mark77]

I bought a set of S637's last fall on Amazon and they were 6 moths from manufacture. Not in the least concerned as they were not mounted and had never been in the sun.

 

[harris71]

Most tire manufacturers provide a chart of inflation recommendations based on actual weight on the tire. I have "G" rated Goodyears and their website indicates 98 lb. inflation based on the weight on the wheels (GVW minus Pin weight divided by 4). Don't assume the max inflation rating on a tire is what you should use.