For delivery estimate

Sailun S637T ST235/80R16 H/16PLY Tire

Trailer - Radial
Radial

Rims Not Included

easy test score

9.5 Superb

Availability

In Stock

Per Tire:

$148.49

Lightning Savings

Was $185.61

$26.08

Estimated Delivery

Shipping

Installation available

Total

See full specs

Authorized distributor of

45 Day Returns

Buy tires without the risk

US based customer support

Se habla español

Category

Trailer - Radial | Radial

4122464

This listing is for new Sailun S637T ST235/80R16 H/16PLY Tires. Manufacturer part number: 4122464.

The Sailun S637T is a tough, all-steel trailer tire built to handle heavy loads with stability and control. Designed for RVs, fifth-wheels, utility trailers, and boat haulers, it provides dependable highway performance and long-lasting durability for frequent towing.

Its five-rib tread design helps maintain straight-line tracking and even wear, while the solid shoulder construction improves stability and reduces irregular tread patterns. Full-depth sipes enhance wet-weather traction, and the steel-belted casing delivers strength and heat resistance under demanding conditions. The S637T’s low-rolling-resistance compound also promotes fuel efficiency and cooler running for longer tire life.

Best suited for: Heavy-duty trailers, RVs, horse trailers, and boat haulers used in highway and regional service.

Tire Features:

All-steel construction supports heavy loads and durability
Five-rib tread pattern promotes stability and even wear
Full-depth sipes improve grip in wet conditions and enhance cooling
Solid shoulders reduce irregular wear for smoother performance
Low-rolling-resistance design improves fuel efficiency and tread life

For nearly 10 years, Giga Tires has served the online tire community. With over 1 million tires sold, 24K+ 5-star reviews, and thousands of tires at your fingertips at unbeatable prices, see for yourself why customers choose Giga as their online tire shop.

1+ Million Tires

Sold Online

Over 24K 5-star

Customer Reviews

10+ Years

In Business

Fast delivery

Get tires to your door

Local installation

Install at local service centers

Buy now, pay later

Convenient financing options

45 day returns

Buy tires without the risk

About the Manufacturer:

Founded in 2002 in Qingdao, China, Sailun Group Co., Ltd. has grown into one of the top 12 tire manufacturers globally, distributing products across more than 180 countries. Sailun operates state-of-the-art, automated smart-factory production facilities in China (Qingdao, Dongying, Shenyang) and Vietnam (Tây Ninh), backed by international R&D centers in North America, Europe, and Asia.

Sailun revolutionized the tire industry with its proprietary EcoPoint3 technology—a sustainable liquid-phase mixing process that simultaneously improves the "Magic Triangle" of tire performance: tread life, wet grip, and fuel efficiency. Demonstrating its high-performance engineering and sidewall durability under extreme heat and torque conditions, Sailun serves as the Official Tire Partner for the Drift Masters European Championship.

Chat

Start chat

Call

(877) 709-4442

We can help! Our trained experts have years of tire fitment experience and are available to answer questions.

Specifications

Specs

Value

Description

Sidewall

Not Available

Describes the sidewall appearance. Examples: BSW= Black Side Wall, WSW = White Side Wall, OWL = Outlined White Letters.

Load Index

130

The load index (LI) is a 2- or 3-digit number that correlates to the maximum amount of weight the tire can carry. For example, a tire with a load index of 87 indicates that the tire can carry a maximum load of 1,201 lbs. In this particularly example, 4 tires (each with a load index of 87) can carry a maximum of 4,804 lbs. Refer to your vehicle owner's manual for the recommended minimum load index.

Speed Rating
Tires speed rating

Speed rating (SR) indicates the maximum speed the tire can achieve. Higher speed ratings are typically associated with better handling capabilities. Refer to your vehicle owner's manual for the recommended minimum speed rating.

Load Range/Ply Rating

H/16PLY

Ply rating, more commonly referred to as load range, represents the strength and durability of the tire. Higher ratings may indicate your tires can handle heavier loads.

UTQG

Not Available

To help consumers evaluate their tires, the U.S. National Highway Traffic Safety Administration (NHTSA) created the Uniform Tire Quality Grading System (UTQG). The UTQG rates tires are rated on their tread-wear, traction performance, and temperature resistance. The grade for each of these can be found on the sidewall of your tire (except for winter tires and certain light truck tires).

Max Single Load(lbs)

4190

The maximum load this tire will support. Remember to multiply this number by the number of tires installed on your vehicle to get the maximum carrying capacity. This number is directly related to the Load Index.

Max Single Air Pressure(PSI)

120

The maximum air pressure this tire will support. This does not represent the amount of air pressure your tires should have at all times. Consult with your owner's manual to determine the best air pressure you should use for your vehicle.

Tread Depth

10.0

The amount of tread on the tire. Once the tire is worn to 2/32nds, it is considered fully used and should be replaced at that time. Most tires will have tire indicators in the grooves of the tire to help you determine when the tires are worn down to 2/32nds.

Tread Design

Nondirectional

The pattern of the grooves, lugs, voids, and sipes on a tire's surface. This design affects the tire's traction, handling, and noise characteristics. Common types include symmetrical (uniform pattern across the tire), asymmetrical (different patterns on the inside and outside for varied road conditions), and directional (designed to rotate in one direction for improved wet traction and hydroplaning resistance).

Rim Width Range

6.0-7.0

The approved wheel rim width range this tire will support.

Measured Rim Width

Not Available

The recommended wheel width as recommended by the tire manufacturer to get the best wear us performance for this tire.

Section Width

9.2

The measurement from sidewall to sidewall.

Tread Width

Not Available

The measurement from one side of the tread to the other side of the tread.

Overall Diameter

Not Available

The height of the tire when fully inflated.

Manufacturer Part Number

4122464

Manufacturer part number (sku)

Financing

You can pre-qualify to finance your tires, or you can simply choose Affirm at check-out. Fill out your information and choose the monthly payment that works best for you!

Select 3, 6 or 12 monthly payments, with rates from 10% - 36% APR. 18 months financing available for orders over $1000.00

Checking your eligibility won't affect your credit. You will receive an immediate answer from Affirm.

Affirm has no hidden fees or costs and is completely secure.
Quick and easy, real tire financing, real fast! You can apply in advance and know you can shop for tires when you are ready.

To learn more visit Buy With Affirm or read their convenient Affirm FAQ's. All credit decisions are made by Affirm.

To contact Affirm regarding your account, please call 1-855-423-3729.

No hidden fees

Affirm has no hidden fees or costs and is completely secure

Flexible

You choose the payment schedule that works for you

Quick and easy

Fill out your information and get a real-time decision

Pay over time

Choose the payment plan that works best for you

Learn more about Affirm tire financing options

No Credit? No problem!

Lease your tires with Katapult!

With a small down payment, and easy payments you can lease your tires. Payments are coordinated with your payday. Read more here about how Katapult works.

No credit required

Simple initial payment

No late fees ever

Payoff early is desired

Learn more about Katapult lease-to-own tire financing

Size Details

Size	Load Index/ Speed index	UTQG	Load Range/Ply Rating	Overall Diameter	Section Width	Rim Width Min	Rim Width Max	Rim Width Meas	Tread Depth (in)	Max Single Air Pressure (PSI)	Max Single Load (lbs)	Max Dual Air Pressure (PSI)	Max Dual Load (lbs)	MFG #
ST225/75R15	121M	-	F/12PLY	-	8.8	5.5	6.5	-	10.0	95	3200	-	-	4120722
ST235/80R16	129/125L	-	G/14PLY	30.8	9.3	-	-	6.5	10.0	110	4080	110	3640	5541960
ST235/80R16	130M	-	H/16PLY	-	9.2	6.0	7.0	-	10.0	120	4190	-	-	4122464
ST235/85R16	L	-	G/14PLY	31.7	9.3	-	-	6.5	12.0	110	4400	110	3860	5540993
ST235/85R16	133M	-	H/16PLY	-	9.2	6.0	7.0	-	12.0	120	4540	-	-	4122465