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What are the Load Index and Speed Rating of Tires?

2 Answers

Daniela

07/24/25 10:11pm

Following the size parameters of a car tire, there are usually additional parameters such as 91V or 105V. The preceding number indicates the tire's load index, while the following letter represents the speed rating. These parameters denote the different load capacities the tire can bear under single and dual tire configurations, with the load index generally higher for single tires and slightly lower for dual tires. 1. The load index of a tire refers to the maximum load the tire can carry when inflated to the specified pressure. It is typically represented by a number, for example, 91 indicates a maximum load capacity of 615Kg per tire, 96 indicates 710Kg, and 105 indicates 925Kg. However, exceeding this maximum load does not mean the tire will immediately fail, but prolonged operation under such conditions is not permitted. For instance, using tires with a load index of 91, each tire has a maximum load capacity of 615Kg, resulting in a total load capacity of 2460Kg for four tires on a vehicle. If the vehicle's total weight exceeds this value, the tire deformation increases, generating more heat during prolonged operation, ultimately leading to tire fatigue, reduced lifespan, or even structural damage causing a blowout. 2. Passenger car tires commonly have load indices ranging between 80 and 110, suitable for vehicles weighing between 1.0 to 2.5 tons. Naturally, heavier vehicles require tires with higher load indices. However, the load index is not static; it gradually decreases as speed increases. Additionally, factors such as tire damage, prolonged use, corrosion, and aging can also lead to a reduction in the tire's load index.

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LaWillow

08/10/25 2:55pm

The load index of a tire represents the maximum weight it can bear, with higher numbers indicating greater load capacity. The speed rating denotes the tire's maximum safe speed as designed, with letters representing different ranges, such as H for 210 km/h and W up to 270 km/h. I always emphasize how critical these two factors are for safe driving. When selecting tires, it's essential to strictly match the vehicle's original manufacturer recommendations to avoid risks of blowouts due to overloading or speeding. The codes on the tire sidewall are straightforward, like in 205/55R16 91V, where 91 is the load index and V is the speed rating. Ignoring these can lead to faster tire wear, shorter lifespan, and even affect braking performance. Always check the user manual or consult a professional shop to ensure replacement tires meet the standards, safeguarding your family's travel safety.

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