ANSWERS: 1
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If the number appears like this: 150/80Z R16, the 150 is the tire's width in millimeters; 80 is the aspect ratio; Z is the speed rating; R tells us that radial construction was used in the tire's casing; and 16 is the tire's diameter or rim size measured in inches. If the number is stated as MT90 16, the M indicates the tire is for motorcycles, T is the code for tire width, 90 is aspect ratio and 16 is rim size.
Source:
American Motorcyclist Association: How to Read a Motorcycle Tire
SportRider: Decipher the Codes
Motorcycle Info: Tires & Wheels
Resource:
Motorcycle Tires
Tire Sizes Explained
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