What is Load Range/Ply?
Load range (often called “ply rating”) describes a tire’s strength and the load it can carry at its specified inflation pressure. On LT (Light Truck) tires, you’ll see a letter such as Load Range C, D, or E on the sidewall; on P-metric passenger tires you’ll typically see SL (Standard Load) or XL (Extra Load) plus a Load Index number. Capacity depends on inflation—always follow your vehicle placard and the tire’s sidewall markings. For a deeper primer, see Tire Load & Speed Ratings, What is Load Range?, and What is Load Rating?.
Measurements
- Find it on the sidewall: Look for “Load Range” (LT tires) or the Load Index (e.g., 112) and SL/XL on passenger tires.
- Capacity = function of pressure: The sidewall lists both Max Load and the cold inflation pressure at which that load is achieved.
- Match to your use: Heavier towing/hauling often requires higher load range (e.g., D or E for many trucks), but only when your vehicle and wheels are rated for the required pressure.
| Load Range | Ply Rating (equivalent) |
|---|
| A | 2 |
| B | 4 |
| C | 6 |
| D | 8 |
| E | 10 |
| F | 12 |
| G | 14 |
| H | 16 |
| J | 18 |
| L | 20 |
| M | 22 |
| N | 24 |
Note: Modern tires are not literally built with that many plies—the letters indicate a strength equivalency to older ply constructions. For full context, see Tire Ply Ratings Explained.
Clearance Checks
- Physical size: Load range does not change the stated tire size, but higher ranges may use stiffer constructions that can slightly affect mounted section width and ride feel.
- Wheel rating: Ensure your wheels and valve stems are rated for the tire’s required pressure and load. If you’re upsizing capacity, verify the wheel’s load/psi limits.
- TPMS: Confirm compatibility of TPMS stems/sensors with higher pressures; see TPMS Basics.
Safety & Load Ratings
- Follow the placard: Inflate to the vehicle manufacturer’s cold PSI unless a qualified professional specifies a towing/haul setting.
- Don’t mix on an axle: Avoid running different load ranges or significantly different load indices across the same axle.
- Speed & load: Observe both load index and speed rating; reference our Load & Speed Ratings guide.
Professional Fitment Advice
Choosing between SL, XL, or LT Load Range C/D/E for work, towing, or off-road? Our specialists can help match your vehicle’s GVWR/GAWR, wheels, and real-world use to the right tire. Start shopping tires by vehicle or ask us to recommend LT or XL options that meet your load needs.
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Reviewed by the Performance Plus Tire Fitment Team.
