What Is a 117 Load Index on a Tire — and Does It Matter for Your Vehicle?
If you've ever looked closely at the sidewall of a tire and noticed a number like 117 stamped near the size code, you're looking at the load index — one of the most practical and most overlooked numbers in tire selection. Understanding what it means, and what happens when it doesn't match your vehicle's requirements, is basic knowledge every driver benefits from having.
What the Load Index Actually Measures
The load index is a standardized numerical code that represents the maximum weight a single tire can safely support when properly inflated. It's not a weight in pounds or kilograms printed directly — it's a reference number that corresponds to a specific weight capacity on a standardized chart used across the tire industry.
A load index of 117 corresponds to a maximum load capacity of 2,833 pounds (1,285 kg) per tire. On a vehicle with four tires, that works out to a theoretical combined maximum of approximately 11,332 pounds — though real-world safe load ratings account for many other factors beyond just the tires.
You'll typically find the load index as part of the full tire description on the sidewall. For example, in a size like 265/70R17 117S, the 117 is the load index and the S is the speed rating.
Where Load Index 117 Typically Appears
A 117 load index sits in the upper-middle range of common passenger and light truck tire ratings. It's not typically found on compact car tires, which usually carry load indexes in the 80–95 range. Instead, 117 is most commonly associated with:
- Full-size pickup trucks (half-ton and three-quarter-ton)
- Large SUVs and body-on-frame vehicles
- Light commercial vehicles
- Vans with higher payload requirements
This makes sense. A tire rated at 117 can carry significantly more weight per corner than a tire rated at, say, 95 (which maxes out at 1,521 lbs). Trucks and large SUVs need tires that can handle not just the vehicle's own weight, but cargo, passengers, and towing tongue weight.
| Load Index | Max Load Per Tire | Typical Application |
|---|---|---|
| 95 | 1,521 lbs (690 kg) | Mid-size sedans, crossovers |
| 103 | 1,929 lbs (875 kg) | Mid-size SUVs, light trucks |
| 110 | 2,337 lbs (1,060 kg) | Full-size SUVs, half-ton trucks |
| 117 | 2,833 lbs (1,285 kg) | Full-size trucks, vans, large SUVs |
| 121 | 3,197 lbs (1,450 kg) | Heavy-duty trucks, commercial |
Why Matching the Load Index Matters
The load index stamped on your original tires isn't arbitrary — it was chosen by the vehicle manufacturer based on the Gross Vehicle Weight Rating (GVWR), weight distribution, suspension design, and intended use of that vehicle. That value is typically found on the door jamb sticker (the Tire and Loading Information label), which lists the minimum acceptable load index for replacement tires.
Going below the required load index is a safety issue. A tire operating beyond its rated capacity can overheat, deform, or fail — especially under load, at highway speeds, or in hot conditions. It may also void your tire warranty and, depending on the situation, affect your insurance coverage in the event of an accident.
Going above the required load index is generally acceptable, but it doesn't always translate to benefits for everyday driving. Higher load index tires are often stiffer, which can affect ride quality on vehicles not designed to use them.
The Variables That Shape What's Right for Your Setup 🔧
The "right" load index for a replacement tire isn't a one-size-fits-all answer. Several factors influence what's appropriate:
- Your vehicle's door jamb specification — this is the baseline minimum, set by the manufacturer
- How you use the vehicle — a truck used for towing or hauling near max capacity has different needs than the same model driven empty daily
- Tire type and construction — some tires (like LT-metric tires with a "Load Range E" rating) use a different load rating system altogether, separate from the standard index
- Dual rear wheel setups — these use a different load calculation than single-rear-wheel vehicles
- Aftermarket wheel and suspension changes — lifting a truck or changing wheel offset can affect how load is distributed across the tire
It's also worth noting that the same tire size can come in multiple load index versions. A 275/65R18 might be available in a 114 or a 116 or a 123 load index depending on the manufacturer and construction. Picking the right one means knowing what your vehicle actually requires — not just matching the size number.
When a 117 Load Index Shows Up on a Tire You're Considering
If you're comparing tires and see one rated at 117, that number tells you something concrete: this is a tire built for vehicles that carry serious weight. Whether that's the right tire for your specific vehicle depends on what load index your door jamb requires, how you intend to use the vehicle, and whether the rest of the tire's specifications — speed rating, tread pattern, load range designation — line up with your setup. 🚛
The load index is one piece of a larger matching puzzle. Diameter, width, aspect ratio, speed rating, and construction type all have to align as well. A tire that passes on load index but fails on speed rating or load range can still be the wrong fit.
Your vehicle's documentation and the door jamb placard are the starting points. What you do from there depends on your specific truck, SUV, or van — and what you actually put it through.