Why load index matters more than many shoppers think
Load index tells you how much weight a tire is designed to support when it is inflated correctly. It is one of the easiest tire specs to overlook, and one of the worst ones to get wrong.
The right replacement tire is not just the right size. It also needs to carry the vehicle safely in the way the manufacturer intended, whether that means a compact sedan, a three-row SUV full of passengers, or a pickup that actually hauls.
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Common load index chart
| Load Index | Approx. Capacity Per Tire |
|---|---|
| 91 | 1,356 lbs |
| 94 | 1,477 lbs |
| 95 | 1,521 lbs |
| 98 | 1,653 lbs |
| 100 | 1,764 lbs |
| 104 | 1,984 lbs |
| 109 | 2,271 lbs |
| 112 | 2,469 lbs |
| 116 | 2,756 lbs |
| 121 | 3,197 lbs |
Four key things to know
Load index is not optional
It is a core safety spec, not a suggestion. If the replacement tire is under-rated, you have reduced the tire’s intended weight capacity before you even leave the shop.
Vehicle placards beat guesswork
Your door-jamb placard and owner’s manual are the starting point. Do not try to reverse-engineer the answer from looks, brand reputation, or what other drivers are doing online.
Higher is usually fine, lower is not
A higher load index often means more carrying capacity and sometimes a slightly firmer feel. Going lower is where the real risk starts.
XL and LT change the conversation
Extra Load passenger tires and LT tires often carry higher capacities, but they can also change ride feel, inflation targets, and cost. Buy them because your vehicle needs them, not because they sound tougher.
What XL, SL, and LT really mean
SL or Standard Load
Common on mainstream passenger cars and many everyday all-season tires. Fine when it matches the vehicle requirement.
XL or Extra Load
A passenger tire built to carry more weight at higher inflation pressures. Common on heavier sedans, crossovers, and EVs.
LT or Light Truck
Designed for heavier-duty truck use, towing, hauling, and harsher service. LT is not automatically better - it is better only when the vehicle and use case actually need it.
Common buying mistakes
Frequently Asked Questions
What is tire load index?
Load index is a numeric code that represents how much weight a tire can carry when it is properly inflated. It is one of the most important fitment checks when replacing tires.
Can I use a tire with a higher load index than stock?
Usually yes, as long as the tire still fits correctly and matches the vehicle’s other requirements. A higher load index is generally safer than going lower, though ride quality and cost can change.
Can I use a lower load index if I do not carry heavy cargo?
No. You should match or exceed the vehicle’s required load index even if you rarely carry passengers or cargo. The requirement already includes safety margins and intended vehicle use.
Is load index the same thing as load range?
No. Load index is the specific weight-carrying code for a tire, while load range is a broader construction class often seen on LT tires. They are related, but not interchangeable.
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