Fillable Printable Tire Sizes and Conversion Chart

Tire Sizes and Conversion Chart

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), the Alphanumeric System (for example: MT 90-16) and the Metric

System (for example: 130/90 - 16). The last numbers are to describe the rim

size. 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".

Dwight Rudder, 7 time ISDT / ISDE Medalist

Metric(90%) Inch-System (100%) Inch-System (85%) Metric (100%)

80/90 2.75 ---- ----

90/90 3.00/3.25 ---- 80/100

100/90 3.25 3.60 ----

------- 3.50 4.10 90/100

110/90 4.00/4.25 ---- 100/100

120/90 ---- 4.25/85 110/100

130/90 4.50 5.10 120/100

Front Tires

Metric

Alpha Inch

60/100 90/80 2.50/2.75

70/100 90/90 2.75/3.00

80/100 100/80 3.00/3.25

Rear Tires

Metric

Alpha Inch

80/100 80/90 2.50/3.00

90/100 110/90 3.60/4.10

100/100 120/80 4.00/4.25

110/100 130/80 4.25/4.50

120/100 140/80 4.50/5.10