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Tire Load & Speed Rating Lookup
Turn the load index number and speed rating letter on your sidewall into plain meanings, and check that a replacement tire meets what your vehicle requires.
Load & speed rating lookup
Enter the numbers and letters molded on your tire's sidewall (for example 91H) to see the associated ratings.
Shown as a number just before the speed letter, e.g. 91 in 91H.
Rating meaning
- Max load per tire
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- Max speed
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The exact speed and load symbol layout varies by tire (single vs. dual fitment). Always verify that the replacement tire meets or exceeds the ratings your vehicle manufacturer specifies.
How to use this tool
Find the service description on the sidewall — a number followed by a letter, such as 91V. Enter each part to see what it means and why it matters for fitting.
- Locate the load index number and speed rating letter on the tire sidewall, usually after the size.
- Enter the load index number to see the maximum load it represents per tire.
- Enter the speed rating letter to see the maximum speed it is rated for, then compare both with your vehicle's requirements.
A tire marked 91V carries a load index of 91, which corresponds to roughly 1,356 pounds per tire, and a speed rating of V, which corresponds to 149 mph. Fitting a tire with a lower index or rating than your vehicle specifies is not safe.
What the results mean
The load index is a code for the maximum weight a single tire can carry when inflated correctly. The speed rating is a code for the maximum speed the tire is designed to sustain. Manufacturers set minimum requirements for your vehicle based on its weight and capability, and replacements should meet or exceed them.
How it is calculated
Each load index number maps to a maximum load in pounds or kilograms on a standard table, and each speed rating letter maps to a maximum speed in miles per hour. The lookup simply returns the table values, which are defined by industry standards rather than calculated.
Important limitations
Rating tables give the tire's design limits, not your vehicle's safe operating limits, and they assume correct inflation and load distribution. Always fit a tire that matches or exceeds the load index and speed rating your vehicle manufacturer requires, and never fit a lower-rated tire to save money.