Load Range Chart: What the Letters on Your Tires Actually Mean
If you've ever looked at a tire sidewall and seen a letter like C, D, E, or SL after the tire size, that's the load range — and it tells you more about what that tire can handle than most drivers realize. Understanding the load range chart isn't just useful for truck owners. It matters any time you're replacing tires, towing, hauling, or trying to match the right tire to the right vehicle.
What Is Tire Load Range?
Load range is a rating system that indicates how much air pressure a tire can safely hold and, by extension, how much weight it can carry. Higher load ranges can handle more weight and higher inflation pressures.
The system replaced an older ply rating system that counted the actual layers of rubber inside a tire. Modern tires are built differently — fewer physical layers, stronger materials — so the ply rating became misleading. Load range letters now describe the equivalent strength and capacity, not the literal construction.
The Load Range Chart: Letters, Pressures, and Ply Ratings
| Load Range | Equivalent Ply Rating | Max Load Pressure (PSI) | Typical Use |
|---|---|---|---|
| B | 4-ply | 35 PSI | Passenger cars, trailers |
| C | 6-ply | 50 PSI | Light trucks, cargo vans, trailers |
| D | 8-ply | 65 PSI | Light-duty trucks, trailers |
| E | 10-ply | 80 PSI | Heavy-duty trucks, towing, hauling |
| F | 12-ply | 95 PSI | Commercial trucks, heavy payloads |
| G | 14-ply | 110 PSI | Heavy commercial use |
| SL (Standard Load) | 4-ply equivalent | 35–36 PSI | Most passenger cars and crossovers |
| XL / EL (Extra Load) | 4-ply reinforced | 41–42 PSI | Heavier passenger vehicles, performance use |
Note: Maximum load pressure is the tire's rated limit — not necessarily the recommended inflation pressure for your specific vehicle. Always follow your vehicle's door placard for correct inflation.
SL vs. XL: What Passenger Car Drivers Need to Know
Many drivers outside the truck world encounter the SL and XL designations without realizing they're part of the same load range system.
- SL (Standard Load) tires are the baseline for most passenger cars, sedans, and smaller SUVs. They're built to handle typical driving loads at standard inflation.
- XL (Extra Load), sometimes labeled EL (Extra Load) in European sizing, is a reinforced version of the passenger tire category. These tires support higher inflation — typically up to 41–42 PSI — and carry more weight per tire.
XL tires are increasingly common on larger crossovers, loaded minivans, and performance vehicles where the standard load rating would be borderline. If your vehicle came with XL tires from the factory, replacing them with SL tires of the same size is not a safe swap unless you've confirmed the load math works for your vehicle.
Why Load Range Matters When Buying Tires 🚛
Matching load range isn't optional — it's a safety issue. Each tire has a specific load index (a number on the sidewall) that tells you the maximum weight that tire can carry at its rated pressure. Load range affects what pressures are safe and what load index values are achievable.
When you're shopping for replacement tires, you need to match or exceed:
- The load index on your current tires
- The load range rating on your current tires (or what your vehicle manufacturer specifies)
Going to a lower load range — even on a tire that looks identical — can result in a tire that's technically underrated for your vehicle's weight. This matters more when a vehicle is loaded: passengers, cargo, a trailer hitch load, or even just a fully fueled truck bed.
Variables That Change the Calculation
The right load range for your vehicle isn't something that can be answered in a single chart lookup. Several factors shape the answer:
Vehicle type and weight: A half-ton pickup towing a camper has very different needs than a compact sedan. Heavier vehicles put more stress on each tire, especially rear tires under a load.
GVWR and payload capacity: Your vehicle has a Gross Vehicle Weight Rating — the maximum loaded weight the manufacturer designed it to handle. Tires must be rated to support that total weight across all four (or more) contact points.
Towing and hauling use: If you regularly pull a trailer or carry heavy cargo, a higher load range provides additional margin. Even if a lower load range is technically within spec for the unloaded vehicle, frequent heavy use changes the risk profile.
Tire size: Load capacity is tied to both the load range and the physical size of the tire. A larger tire in a lower load range may carry more weight than a smaller tire in a higher load range. You have to look at the actual load index number alongside the range letter.
Inflation pressure: Load range determines the maximum safe pressure, but the right running pressure for your vehicle is set by the manufacturer — often well below that maximum. A C-range tire inflated to 50 PSI on a vehicle that calls for 35 PSI will ride harshly and wear unevenly.
What the Spectrum Looks Like Across Vehicle Types
On one end: a standard passenger car running SL-rated all-season tires at 32–35 PSI. The load range is matched to the vehicle's curb weight and typical passenger load, and the driver rarely thinks about it.
On the other end: a heavy-duty diesel truck with dual rear wheels, running G-rated commercial tires inflated to 110 PSI, designed to handle construction site payloads or a fifth-wheel trailer well over 20,000 pounds. 🔩
In between, you have light-duty pickups, cargo vans, full-size SUVs, and three-quarter-ton trucks — all of which may run C, D, or E-range tires depending on the manufacturer's build and the owner's usage. A half-ton truck used only for commuting may come with a lower load range tire than the same truck configured for towing.
The Part No Chart Can Answer for You
A load range chart tells you what the letters mean and what pressures they correspond to. What it can't tell you is which load range is right for your specific vehicle — because that depends on your vehicle's actual weight, how it's loaded, what the manufacturer specifies, and how you use it. The door placard, owner's manual, and the tire placard give you the baseline. What you do with the vehicle fills in the rest.
