Tire Sizes
There are basically three different systems of tire description:
Inch system (You are probably familiar with it as tire size readings like 5.00 - 16 or 4.50/S/18)
Alphanumeric System (for example: MT 90-16)
Metric System (for example: 130/90 - 16). The last numbers are to describe the rim size. Before that number there is generally a dash or one of the letters S, H or V.
This is key to speed range:
(S) tires are up to 112 mph
(H) tires are admissible for speeds up to 130 mph
(V) tires for 150 mph and up.
Alphanumeric System and Series 80 are describing low-profile tires, which means the height is small than the width and the proportions to the width is fixed.
Only in the Standard Inch-System can we find tires with equal width and height which is then a "square-profile".
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Metric 80/90 90/90 100/90 110/90 120/90 130/90 140/90
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Alphanumeric - NA- MH 90 MJ 90 ML 90 MN90/MP90/MR 90 MT 90 MU 90
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Inch-(Series90) 2.75 3.00/3.25 3.25 3.50 4.00/4.25 5.0 - NA-
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Inch-(Series82) - NA- - NA- 3.60 4.10 4.25/82/4.40 5.10 - NA-
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Size 120/80V16 130/90H16 130/90V16 500S16 MT90H16 3.00 130/90H16 3.00 140/90H16 140/80VB16 140/90H16 150/80V16 160/80H16 160/80H16 200/60VB16 120/80V18 120/90V18 120/90H16 130/80V18 130/70VB18 150/70VB18 140/70V18 170/60VB18 180/55VB18 230/50 X 15 |
Rim 2.75 3.00 3.00 3.00 3.00 3.00 3.50 3.50 3.50 3.50 4.00 4.00 5.50 2.75 2.75 2.75 3.00 3.50 4.00 4.00 4.50 5.50 7.00 to 8.00 |
Overall Width 4.7 5.00 5.2 5.2 5.3 5.4 5.8 5.9 6.0 6.2 6.4 6.8 7.9 4.8 4.8 4.9 5.2 5.4 5.9 6.1 6.9 7.0 9.5 |
Overall Diameter
23.8 25.4 25.0 26.4 25.3 25.6 25.6 24.8 25.8 25.4 26.1 26.1 25.9 25.9 26.4 26.3 26.3 25.4 26.2 25.7 26.0 26.3 25.3 |
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Note: Measurements are based on the given rim widths. A rough rule of thumb: Each additional 1/2-inch of rim width will be approximately 1/4-inch more in each tire width.
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