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For example, 225/45 R17 94W means:

Marking Meaning
225 Tire width in millimeters
45 Aspect ratio; sidewall height is 45% of the tire width
R Radial tire construction
17 Wheel diameter in inches
94 Load index; up to 670 kg per tire
W Speed rating; up to 270 km/h

225/45 R17 94W → Width / Profile / Construction / Diameter / Load / Speed.