Understanding how tire sizing functions is crucial before purchasing a new tire. As illustrated in the diagram below, all the necessary information can be found on the tire.
Load Index: the maximum carrying capacity of the tire, according to the load index table.
In this scenario 94 is related to 670kg as maximum load
Speed Rating: the maximum permissible speed for the tire.
As you can see from the table below, V stand for 240 km/h (150 mph)
Tire Size Designation: a tire of size 215/55R17 indicates a cross section width of 215mm, 55 indicates a height to width ratio of 55% (the ratio of tire side height to cross section width H/S) and R is the structural code for radial tires. 17 is the rim diameter, expressed in inches.
Speed rating indicates the optimal speed that the tire can safely maintain over time.It's the fastest speed a tire can handle before it no longer performs as designed. The higher the speed rating, the better control and handling you'll have at higher speeds.
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