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The tyre index is crucial for several reasons:
tyre load index is a numerical code on the sidewall that indicates the maximum weight a tire can safely carry. It is part of the "service description" found at the end of the tire size code (e.g., in 205/55R16 V, "91" is the load index). Key Takeaways from Tire Index Reviews
Many drivers believe that if their car has a top speed of 120 mph, a "T" or "H" rating is fine. While true statically, the speed rating also affects handling dynamics. A tyre rated will have a stiffer sidewall than a tyre rated H . If you replace V-rated tyres with H-rated tyres, the car will feel "soggy" or vague during cornering. Conversely, putting V-rated tyres on a car designed for H can result in a harsher, noisier ride.
A tyre with an LI of 104 on a car requiring 91 will be extremely heavy, reduce fuel economy, degrade ride quality, and create excessive unsprung mass that damages your shocks and struts.
| Load Index | Kilograms per Tyre | Pounds per Tyre | | :--- | :--- | :--- | | 75 | 387 kg | 853 lbs | | 82 | 475 kg | 1047 lbs | | 85 | 515 kg | 1135 lbs | | 88 | 560 kg | 1235 lbs | | 91 | 615 kg | 1356 lbs | | 94 | 670 kg | 1477 lbs | | 97 | 730 kg | 1609 lbs | | 100 | 800 kg | 1764 lbs | | 104 | 900 kg | 1984 lbs | | 110 | 1060 kg | 2337 lbs |
