Whether you pull a boat to the lake for a short break, transport livestock between farms, or carry heavy equipment to a construction yard, your trailer’s tyres bear the entire job of keeping the load stable on the road. Choosing the wrong size or load range causes more than just poor handling; it brings serious risks such as blowouts or sudden loss of control.

At Go Trailer, we recognize that every towing task differs from the next. Located in Qingdao, China, our company has focused on trailer tyres and wheels for over 15 years. We work to pass along useful information and deliver dependable products that stand up to everyday hauling demands.

Understanding Trailer Tyre Size and Sidewall Markings

The sidewall of a trailer tyre carries far more information than most people realize. Learning to read those markings forms the starting point for making sound choices.

The “ST” Designation vs. Passenger Tyres

The letters “ST” at the beginning of the size code stand for Special Trailer. These tyres differ greatly from passenger (“P”) or light truck (“LT”) models because their sidewalls are built much stronger. That added strength helps control the constant downward pressure and the swaying motion that trailers produce behind a tow vehicle. At Go Trailer, our lineup, including the ST235/85R16, receives careful design attention to handle these exact conditions day after day.

Deciphering the Numbers: Width, Aspect Ratio, and Construction

A size marking such as 195R14LT or 165R13LT breaks down into clear parts. The first number, like 195 or 165, gives the tyre’s section width in millimeters, measured straight across from one sidewall to the other. Wider tyres often add stability on the highway, but they need enough room inside the trailer’s fenders to avoid rubbing. The “R” marks radial construction, now the common choice because it runs cooler and lasts longer on extended trips. Our 195R15LT model, for instance, pairs with a 5 1/2J rim and offers a section width that spreads weight evenly across the contact patch.

Decoding Load Range and Ply Rating

Load range and ply rating often confuse buyers, yet they decide how much weight the tyre can safely support without trouble.

What is Load Range

Load range appears as a letter or number that shows the tyre’s highest safe weight at a given pressure. Higher letters or numbers mean greater carrying ability. Our ST235/85R16 model, for example, carries a speed grade of 124/120L, which translates to strong performance with heavy loads even at highway speeds.

Understanding Ply Rating (PR) in Heavy-Duty Applications

In the past, ply rating counted the actual layers of cotton fabric inside the tyre. Today, it serves as a strength rating that compares to those old layers. Go Trailer supplies several choices for different jobs, including 8 PR on models like the 195R14LT and 185R14LT, and a tougher 10 PR on the ST235/85R16. A 10 PR tyre stands up better to punctures from gravel roads or sharp debris, making it a solid pick for farm trailers or those that regularly travel over unpaved routes.

How to Match Tyre Specifications to Your Hauling Needs

Choosing tyres involves more than finding something that bolts on; it requires matching the tyre to the actual work ahead.

Calculating Gross Vehicle Weight Rating (GVWR)

Start by adding up the empty weight of the trailer plus every pound you plan to load on it. The total capacity from all tyres must beat this GVWR number by a reasonable amount. Take our 14X6J setup with an 850 kg rating per tyre; on a tandem-axle trailer, that adds up to a safe limit based on four tyres working together.

The Significance of Speed Grades

Long highway runs build serious heat inside tyres. Go Trailer designs its tyres with clear speed grades to keep them stable under those conditions. The ST235/85R16 with its 124/120L rating, for example, stays reliable when the trailer carries full weight at normal road speeds.

Why Choose Go Trailer for Your Trailer Tyre Solutions

Buying from Go Trailer means dealing straight with the maker, skipping extra steps and costs that come with distributors.

Premium Product Specifications and Performance

All our tyres meet strict international rules, backed by ISO9001 quality certification. The range covers common sizes for various trailers:

• ST235/85R16 10 PR: Built for the heaviest loads and roughest use.
• 195R15LT and 195R14LT 8 PR: Good fits for utility trailers or those pulling boats.
• 185R14LT and 165R13LT 8 PR: Dependable choices for lighter cage trailers or motorcycle haulers. 
  

Professional Customized Services for Unique Requirements

Standard sizes work for many jobs, but some trailers need something different. Go Trailer runs a full custom service to meet those cases. Our technicians handle the whole job from raw material to finished tyre. Send us your drawings or a sample, and we build the molds and complete the production. Every custom order receives the same careful attention that has kept customers coming back for years.

Quality Assurance and Manufacturing Excellence

The Qingdao factory runs modern automated equipment, from CNC machines to laser cutters. Before any large run starts, we always make and send a pre-production sample for approval. A final check happens before every shipment leaves the building. We update progress every couple of days with photos and videos so customers stay in the loop. This steady approach to quality and communication explains the long partnerships we hold with buyers around the world.

Conclusion

Picking the proper trailer tyre size and load range calls for careful thought about markings, weights, and real-road conditions. Reading the sidewall correctly and matching ply rating to the job keeps travel safe and smooth. At Go Trailer, we stand ready with proven products and custom options shaped to your particular hauling work. Reach out today to see how our 15 years in this field can help with your next load.

FAQ

Q: How can I ensure the quality of the tyres I order from Go Trailer?

A: All our tyres meet ISO9001 international quality standards. We run a careful control system from start to finish. Before any large production run, we send out a sample for your approval. Every finished order also receives a complete final inspection right before shipping.

Q: Does Go Trailer offer customized tyre options for unique trailer designs?

A: Yes. We handle full custom orders. Our technicians make tyres using your samples or detailed drawings. They stay in touch throughout the process to match your exact specifications.

Q: What is the typical delivery time for an order?

A: Orders generally ship within about 35 days once we receive the deposit. The actual timeframe may vary a bit depending on the products and total quantity.

Q: Can I request a sample before placing a large order?

A: Yes, we do that regularly. Samples are prepared to your size and quantity requirements. For smaller amounts, we cover the cost, though shipping fees are paid by the buyer.