The 91H marking on a tire is its service description. The number identifies how much weight one tire is rated to carry, while the letter identifies its tested speed capability. These limits matter when you replace tires, but they must be read with the complete tire size and your vehicle manufacturer’s specifications.
Quick Answer
91H means the tire has a load index of 91 and an H speed rating. A load index of 91 equals 615 kg, or about 1,356 pounds, per tire under specified conditions. H indicates a tested maximum speed capability of 210 km/h, or 130 mph. It is not a recommended driving speed.
Key Takeaways
- 91 is the load index and equals 615 kg or approximately 1,356 pounds per tire.
- H is the speed symbol and corresponds to 210 km/h or 130 mph under specified test and operating conditions.
- The rating applies to one tire; it does not establish your vehicle’s payload or towing capacity.
- A replacement tire should normally meet or exceed the vehicle manufacturer’s required load index and speed rating.
- Check the complete tire size, construction, load category, owner’s manual, and vehicle placard before buying replacements.
What Does 91H Mean on a Tire?
The code 91H combines two different tire limits:
- 91: The tire’s load index, which corresponds to a maximum load of 615 kg or about 1,356 pounds per tire under the specified inflation and service conditions.
- H: The tire’s speed rating, which corresponds to 210 km/h or 130 mph under specified load, inflation, and laboratory-test conditions.
Together, the number and letter are called the tire’s service description. They usually appear immediately after the tire size, as in 205/55R16 91H.
The standardized load-index table published by Pirelli lists index 91 as 615 kg. Continental’s speed-rating chart lists H as 210 km/h or 130 mph.
Note: The number 91 is a code from a conversion table. It does not mean 91 pounds, 91 kilograms, or 91 PSI.
How Much Weight Can 91H Carry?
A tire with a 91 load index has a listed capacity of 615 kg, or approximately 1,356 pounds, per tire. That capacity assumes the tire is in good condition and is used at the inflation pressure and operating conditions required for the load.
Multiplying the per-tire figure by four gives a theoretical combined tire capacity of 2,460 kg, or about 5,424 pounds. However, you must not use that number as your vehicle’s allowable weight or payload.
A vehicle’s actual limits also depend on:
- Gross Vehicle Weight Rating, or GVWR
- Gross Axle Weight Ratings, or GAWR
- Uneven front-to-rear and side-to-side weight distribution
- Wheel and suspension capacity
- Vehicle configuration and approved tire pressure
- Passenger, cargo, accessory, and trailer tongue weight limits
Warning: Do not add the vehicle, passenger, fuel, and cargo weights and simply divide the result by four. Tire loads are not always distributed evenly. Follow the vehicle’s GVWR, GAWR, tire placard, cargo limits, and owner’s manual.
A higher tire load index does not increase the payload, axle rating, or towing capacity assigned by the vehicle manufacturer.
What Speed Rating Is 91H?
The H in 91H corresponds to 210 km/h or 130 mph. It indicates the tire’s tested maximum speed capability under specified load, inflation, temperature, and test conditions.
A speed symbol is not permission to drive at that speed. Posted speed limits, weather, road conditions, tire age, inflation, load, repairs, wear, and vehicle condition can all require a much lower speed.
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Decode 91H Meaning
In the service description 91H, the two characters perform separate jobs. The number tells you the tire’s load capacity, while the letter tells you its speed capability. The H does not change the 615 kg load-index conversion, and the number 91 does not identify the tire’s speed.
H Speed Limit
H is commonly described as a 130 mph or 210 km/h rating. More precisely, it is a standardized test classification. Continental notes that the speed index is established through controlled testing and is not a recommendation for real-world driving speed.
The rating also assumes that the tire has not been weakened by underinflation, overloading, impact damage, improper repairs, excessive wear, or age.
Match Vehicle Needs
A tire marked 91H is suitable only when its complete specification meets the vehicle’s requirements. Matching the service description does not compensate for the wrong width, aspect ratio, rim diameter, load category, construction, or tire type.
For replacement tires, use the specification listed by the vehicle manufacturer. Michelin advises using a load rating that meets or exceeds the required value and normally retaining an equal or higher speed rating.
Warning: The 130 mph figure is not a guarantee that a vehicle, road, or worn tire is safe at that speed. Never exceed posted limits or the lowest applicable limit for the vehicle, tire set, road, and driving conditions.
How to Read the Full Tire Code
To understand 91H correctly, read it as part of the complete sidewall code. For example, consider P205/60R16 91H.
| Mark | Meaning |
|---|---|
| P | P-metric passenger-vehicle tire. Some metric tire sizes do not use a P prefix. |
| 205 | Nominal section width in millimeters. |
| 60 | Aspect ratio. The sidewall height is 60% of the nominal section width. |
| R | Radial tire construction. |
| 16 | Wheel-rim diameter in inches. |
| 91 | Load index: 615 kg or approximately 1,356 pounds per tire under specified conditions. |
| H | Speed rating: 210 km/h or 130 mph under specified conditions. |
Decoding Tire Size
The size portion identifies the tire’s basic dimensions and construction. A tire can have the same 91H service description as another tire while having completely different dimensions. For example, a 195/65R15 91H and a 205/55R16 91H share the same load and speed symbols but are not interchangeable sizes.
Always match the approved size as well as the service description. Changes in width, sidewall height, or rim diameter can affect clearance, speedometer accuracy, braking systems, handling, and load capacity.
Reading Load and Speed
| Service Mark | What It Tells You |
|---|---|
| 91 | Maximum listed load of 615 kg or about 1,356 pounds for one tire under specified conditions. |
| H | Maximum rated speed capability of 210 km/h or 130 mph under specified conditions. |
The load and speed symbols must be considered together with the complete size, construction, inflation requirements, and vehicle specifications.
What 91H Does Not Tell You
The marking 91H provides only load-index and speed-rating information. It does not tell you everything needed to compare or replace a tire.
By itself, 91H does not identify:
- Recommended cold tire pressure
- Whether the tire is summer, winter, all-season, or all-weather
- Wet braking, snow traction, or dry grip
- Expected tread life or mileage warranty
- Ride comfort or road noise
- Fuel efficiency or rolling resistance
- Whether the tire is standard load, Extra Load, High Load, or another construction category
- Whether it is run-flat
- The tire’s age or manufacturing date
- The tire’s UTQG treadwear, traction, and temperature grades
UTQG grades are a separate comparison system. They do not replace the tire size, load index, speed rating, or vehicle fitment requirements.
Where to Find the Tire Speed Rating
The speed symbol appears on the tire sidewall at the end of the service description. In P205/60R16 91H, the final letter H is the speed rating and 91 is the load index immediately before it.
To determine what your vehicle requires, check:
- The vehicle owner’s manual
- The Tire and Loading Information label on the driver-side door edge or door jamb
- The original-equipment tire specification
- An approved manufacturer fitment guide
- A qualified tire installer
The vehicle placard is also the main source for the manufacturer-recommended cold tire pressure. NHTSA advises using the pressure on the vehicle label or in the owner’s manual rather than treating the maximum-pressure marking on the tire sidewall as the normal inflation target.
Pro Tip: Photograph the vehicle placard and the complete sidewall code before shopping. This helps you compare the size, service description, load category, and cold-pressure requirement without relying on memory.
Why Load Index and Speed Rating Matter
The load index and speed rating identify operating limits that help a tire support the vehicle and manage heat and stress. Using a tire below the manufacturer’s required load index can increase deflection and heat buildup, especially when the vehicle is heavily loaded or the tire is underinflated.
A lower speed rating may also change the vehicle’s maximum rated capability and handling response. Michelin advises that replacement tires should normally meet or exceed the speed rating specified by the vehicle manufacturer.
These markings matter even when you never approach the listed maximum speed. They are part of the tire specification selected for the vehicle’s weight, suspension, handling, and operating characteristics.
Can You Use a Different Speed Rating?
A tire with a higher speed rating can often be used when its size, load capacity, construction, inflation category, and other specifications are compatible. A higher symbol does not automatically make it a better tire; it only confirms a higher tested speed capability.
Using a lower speed rating is generally not recommended unless the vehicle or tire manufacturer specifically allows it. Some winter-tire installations use a lower speed symbol, but the driver must observe the tire’s reduced limit and any vehicle display, labeling, or local regulatory requirements.
| Speed Symbol | km/h | mph |
|---|---|---|
| S | 180 | 112 |
| T | 190 | 118 |
| H | 210 | 130 |
| V | 240 | 149 |
For the most predictable performance, use matching tires at all four wheel positions. Continental recommends matching the size, tread pattern, construction, load index, and speed rating. If exact matching is not possible, have a qualified installer confirm the safest arrangement for the vehicle.
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How to Choose the Right Replacement Tire
Choosing a replacement tire involves more than finding another tire marked 91H. Use the following checks before installation:
- Confirm the full size. Match the approved width, aspect ratio, construction, and rim diameter.
- Match the load index. Use a rating that meets or exceeds the vehicle manufacturer’s minimum requirement.
- Match the speed rating. Use the original rating or an approved alternative. Do not downgrade it only to save money.
- Check the load category. Match required markings such as SL, XL, HL, reinforced, or an applicable Load Range.
- Use the vehicle’s cold pressure. Inflate according to the placard or owner’s manual, not automatically to the maximum pressure molded on the tire.
- Match the tire type to the conditions. Consider wet roads, winter conditions, heat, mileage, road noise, and driving style separately from 91H.
- Avoid unnecessary mixing. Matching all four tires is preferred. Follow special circumference and tread-depth limits for all-wheel-drive vehicles.
- Use professional installation. New tires should be correctly mounted, balanced, inspected, and checked for wheel compatibility.
When replacing only two tires, follow the vehicle and tire manufacturers’ instructions about axle placement. Many tire manufacturers recommend installing the pair with deeper tread on the rear to support stability on wet roads, but vehicle-specific instructions take priority.
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Frequently Asked Questions
Which is better, 91H or 91V?
Neither is universally better. Both have the same 91 load index and therefore the same 615 kg load-table value. V has a higher speed capability of 149 mph, compared with 130 mph for H. Use the rating specified for your vehicle rather than choosing solely by the higher letter.
Is speed rating T or H better?
H has a higher tested speed capability: 130 mph compared with 118 mph for T. That does not mean every H-rated tire has better wet grip, comfort, tread life, or fuel economy. The correct choice is the rating and tire model approved for the vehicle.
Which is better, S or H speed rating?
H has a higher speed capability of 130 mph, while S corresponds to 112 mph. H is not automatically the better replacement. Use the minimum rating required by the vehicle manufacturer and compare each tire model’s actual traction, comfort, and wear characteristics separately.
What is the difference between 89H and 91H tires?
Both use the H speed symbol, but their load capacities differ. Load index 89 corresponds to 580 kg or about 1,279 pounds per tire. Load index 91 corresponds to 615 kg or about 1,356 pounds. Do not replace a required 91 tire with an 89 unless the vehicle manufacturer specifically approves it.
Can I replace a 91V tire with a 91H tire?
The load index would remain the same, but the speed rating would be reduced from V to H. This is normally not recommended unless the vehicle manufacturer approves the change, such as for certain winter-tire applications. The vehicle’s rated speed capability would be limited by the lower-rated tire.
Does 91H tell me the correct tire pressure?
No. The recommended cold pressure comes from the vehicle’s Tire and Loading Information label or owner’s manual. The maximum-pressure marking on the tire sidewall is not automatically the correct daily inflation pressure.
Do four 91-rated tires mean the vehicle can weigh 5,424 pounds?
No. Four times 1,356 pounds is the theoretical sum of the tire load-table values, not the vehicle’s approved weight. The vehicle must remain within its GVWR, front and rear GAWR, cargo limit, wheel ratings, and other manufacturer restrictions.
Conclusion
The marking 91H means a load index of 91 and an H speed rating. In standardized tables, 91 corresponds to 615 kg or about 1,356 pounds per tire, while H corresponds to 210 km/h or 130 mph under specified conditions.
Those figures are only part of a correct tire fitment. Match the complete size, load index, speed rating, construction, and load category to the vehicle manufacturer’s specification. Use the vehicle placard for cold inflation pressure, stay within the vehicle’s GVWR and axle ratings, and consult a qualified tire professional when changing any original specification.
Sources
- National Highway Traffic Safety Administration: TireWise — vehicle placards, cold inflation pressure, tire size, and general tire-safety guidance.
- Michelin: Tire Load Rating and Speed Rating Explained — service descriptions, replacement ratings, and lower-speed-rating guidance.
- Pirelli: Tire Load Index and Chart — standardized load-index conversions, including index 91.
- Continental: Tire Speed Index — speed-symbol definitions, test limitations, and S, T, H, and V conversions.
- Continental: Mixing Tires — matching size, construction, load index, speed rating, and tread patterns.
