Replacing 7-Year-Old Sailun S637 Trailer Tires

[WhatExit?]

From the internet...

Sailun Tires

• • Popular Model: S637 TST (all-steel heavy-duty trailer tire)
  • Load Rating: Frequently available in high-capacity Load Range G (14-ply) or higher.
  • Reputation: Many users on forums like Forest River Forums agree that Sailun S637s are the gold standard budget/mid-tier upgrade for heavy fifth wheels, noting exceptional long-term durability.
  • Consideration: Their thick, heavy-duty commercial beads can sometimes make them harder to mount on standard rims, occasionally requiring a commercial truck tire shop.

Hercules Tires

• • Popular Model: H901 ST (commercial-grade special trailer tire)
  • Load Rating: Solid 12-ply and 14-ply G-ratings built for heavy loads.
  • Reputation: Users on platforms like Keystone Forums report that Hercules H901 tires provide robust, trouble-free service under full-load conditions and match up well against competing heavy-duty options.
  • Consideration: Often chosen as a direct alternative when local dealers do not stock Sailun inventory.

 

[scootsk]

Bought five in late April from simple tire, they were from October and November of 2025. So that almost seems as fresh as you can get

 

[WhatExit?]

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

My post (above) in another thread:

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 searched around including calling a number of local RV shops. Two places came back with pricing just over $1700 for 5 tires, balanced and mounted, disposal, tax, etc. One was $347.68 + tax per tire, installed x 5 = $1,738.00

During my search I found www.Giga-Tires.com which is where I ended up buying from. 5 tires at $653.15 ($130.63 each) + Shipping Cost: $141.75 + Handling Fee $24.50 + FET Amount Tax: $227.40 = $846.80 total.

OK, so what about installation? Easy peezy. I went to my local Discount Tire. I brought in the Sailun tires and they dismounted & mounted, balanced, and discarded 5 tires for $183.95

Total cost for 5 brand new Sailun tires $1,032.75 - a savings of $705.25 (40% of the quoted $1738 total).

Note that I checked the date codes and they all were the same and made a few months ago so they are new - this is something I was concerned about buying from anyone especially an online company I wasn't familiar with.

 

[RetiredandRollin]

For what it's worth, I've changed my Sailun Tires twice due to mileage (wear). I have had really good luck with them so I guess I'm from the "don't look a gift horse in the mouth". They are definitely not free, but they worked well for us. Each time I have ordered from SimpleTire and have received my tires within a few day. Only one time did the date codes caught my attention, they were almost a year old. I picked up the phone and called customer service. They went way out of their way to ensure I was satisfied. They sent return labels, sent FedEx to my house to pick up and delivered tires with a newer manufacturing code. They were, don't quote me on this one, I think $179 a tire.