Metric and standard tire conversion chart

 Tire size conversion chart 

 (Common agricultural tire sizes listed) 

 Inch size 

 Metric conversion (mm) 

11.4

290

12.4

315

12.6

320

13.6

345

14.9

378

15.0

380

16.5

420

16.9

429

18.4

467

18.9

480

20.5

520

20.8

528

22.8

580

23.1

587

23.6

600

24.4

620

25.6

650

28.0

710

30.0

750

30.5

775

31.5

800

35.4

900

Formula for metric
to English conversion
:
divide metric number (in mm)
by 25.4 to get inches

Example:
480-mm section width / 25.4 =
18.89-in. section width tire

Formula for English
to metric conversion
:
multiply English number (in inches)
by 25.4 to get millimeters

Example:
18.4-in. section width X 25.4 =
467-mm section width tire

 
Last Updated : 25-Jul-2013