Load Range E on 235/85R16 Trailer Tires: 14 Ply Explained

If you’re shopping for 235/85R16 trailer tires and need to understand Load Range E, the direct answer is that it’s a 10-ply equivalent rating, not 14-ply. The mix-up is common, because product listings and old habits often refer to “14 ply” without specifying the load range letter. This article clears up the difference, shows what the rating actually means, and gives you the specs to compare tires confidently. By the end, you’ll know exactly what to look for on the sidewall and in the spec sheet.

Load Range E: The Direct Answer

Load Range E on a 235/85R16 trailer tire indicates a 10-ply equivalent, which means the tire is built to handle the same inflation pressure and load as older tires with ten physical plies. The term “ply rating” is a leftover from when tires were literally constructed with layered rubber and fabric. Today, the letters on the sidewall are the official grading system, and the ply rating is just a rough equivalent. That’s why an E-marked tire should never be assumed to equal 14-ply, and why it’s risky to buy based on the word “ply” alone.

Why “14 Ply” and Load Range E Get Confused

Tire listings often describe Load Range E as “10 Ply Rated,” which is correct. The confusion starts when a buyer with a heavy trailer sees the number 14 and assumes the tire will cover it. As explained in RhinotiresUSA’s load range comparison, the ply rating is a marketing term that roughly corresponded to strength in the old days, but the official system is the load range letter. Since tire manufacturers can design the same size with different capacities, you cannot rely on “14 ply” alone when choosing a tire. Always read the sidewall, which lists the maximum pressure and load, and match it to your trailer’s actual weight. For example, the Goodyear Endurance and Carlisle Radial Trail HD are both Load Range E, yet their published specs differ slightly.

Typical Specs for 235/85R16 Load Range E Trailer Tires

The exact numbers depend on the manufacturer and model. Common models in this size include the Carlisle Radial Trail HD, Goodyear Endurance, Kenda Loadstar TR603, and Westlake ST-100.

The “ST” at the front of the size stands for Special Trailer, and that’s a major distinction. ST tires are built for trailer axles, with stiffer sidewalls to handle the constant flex of towing. They aren’t meant for passenger cars or trucks. Fitment is consistent across the size: most ST235/85R16 tires measure about 31.6 inches in overall diameter and just over 9 inches in section width. Recommended rim widths usually range from 6.0 to 7.5 inches. Before buying, measure your current wheel and confirm the diameter and rim width match.

Load range alone doesn’t determine whether a tire is right for your trailer. The wheel, axle, and suspension must all be rated for the loaded weight, and the tire must be inflated to the manufacturer’s specified pressure to achieve its stated capacity. Overloading, even within the load range, causes heat buildup and can lead to a blowout. Check the trailer’s gross vehicle weight rating (GVWR) and the axle rating before you commit to a tire.

When you’re ready to narrow down your options, our tested roundup of 235/85R16 trailer tires compares the leading models side by side. Check the load ratings, speed ratings, and price points before you buy.