What does 100W mean on a tire?

2 Answers
CeciliaAnn
07/25/25 6:16am
Tire 100W represents the following meanings: 1. The number 100 represents the load index of this tire, indicating that the maximum load this tire can bear is 800 kilograms. Common load indexes for household tires are 90 or 100, corresponding to single load capacities of 600 or 800 kilograms respectively. 2. W refers to the maximum speed this tire can withstand, identified by letters and numbers, where W represents a tire speed limit of 270km/h. Common tire speed ratings besides W include S, T, and H.
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DiEmiliano
08/10/25 6:06pm
When I was helping out at the auto repair shop, I noticed the marking '100W' on the tires. The '100' refers to the load index, indicating that each tire can bear a maximum weight of about 800 kilograms. The heavier the vehicle, the more attention needs to be paid to this number. The 'W' is the speed rating, representing a maximum speed of 270 kilometers per hour. While this might not be necessary for regular road driving, it becomes crucial for high-speed driving or sports cars. I must say, when choosing tires, it's essential to match the vehicle's specifications. For instance, smaller cars can opt for lower ratings to save costs, but exceeding the limits can easily lead to tire blowouts, which is very dangerous. I also recommend regularly checking tire pressure to maintain optimal levels, which can extend tire life. Overall, these markings help ensure safe driving, so don't overlook these small details—saving money shouldn't come at the risk of your life.
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