This chart is meant to be used as a reference only as to how tractor tire sizes have changed and convert. You will find some sizes on this list that were never produced, never made in radial versions, or in the case of the newest metric radial sizes are still in development and yet to be produced.


Size Prior to 1955

Dual Marked Size

(transitioning )

Modern Size

Radial Size

Closest

Metric Radial Size

on same size wheel

 

 

 

11.2-20

11.2R20

285/80R20

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12.4-20

12.4R20

320/85R20

8-22

8.3/8-22

8.3-22

8.3R22

 

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9-22

9.5/9-22

9.5-22

9.5R22

 

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8-24

8.3/8-24

8.3-24

8.3R24

 

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9-24

9.5/9-24

9.5-24

9.5R24

250/85R24

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10-24

11.2/10-24

11.2-24

11.2R24

280/85R24

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11-24

12.4/11-24

12.4-24

12.4R24

320/85R24

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12-24

13.6/12-24

13.6-24

13.6R24

340/85R24

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13-24

14.9/13-24

14.9-24

14.9R24

380/85R24

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14-24

16.9/14-24

16.9-24

16.9R24

420/85R24

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17.5L-24

17.5LR-24

 

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15-24

18.4/15-24

18.4-24

18.4R24

 

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19.5L-24

19.5LR-24

 

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21L-24

21LR-24

 

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12-26

13.6/12-26

13.6-26

13.6R26

 

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13-26

14.9/13-26

14.9-26

14.9R26

380/85R26

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14-26

16.9/14-26

16.9-26

16.9R26

 

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15-26

18.4/15-26

18.4-26

18.4R26

420/85R26

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23.1-26

23.1R26

 

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28L-26

28LR-26

750/65R26

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9-28

9.5/9-28

9.5-28

 

 

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10-28

11.2/10-28

11.2-28

11.2R28

280/85R28

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11-28

12.4/11-28

12.4-28

12.4R28

320/85R28

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12-28

13.6/12-28

13.6-28

13.6R28

340/85R28

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13-28

14.9/12-28

14.9-28

14.9R28

380/85R28

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14-28

16.9/14-28

16.9-28

16.9R28

420/85R28

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15-28

18.4/15-28

18.4-28

18.4R28

 

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7.2-30

 

 

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13-30

14.9/13-30

14.9-30

14.9R30

380/85R30

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14-30

16.9/14-30

16.9-30

16.9R30

420/85R30

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15-30

18.4/15-30

18.4-30

18.4R30

460/85R30

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23.1-30

23.1R30

620/75R30

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9-32

9.5/9-32

9.5-32

9.5R32

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11-32

12.4/11-32

12.4-32

12.4R32

320/85R32

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24.5-32

24.5R32

650/75R32

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30.5L-32

30.5LR-32

800/65R32

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11-34

12.4/11-34

12.4-34

12.4R34

320/85R34

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12-34

13.6/12-34

13.6-34

13.6R34

340/85R34

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13-34

14.9/13-34

14.9-34

14.9R34

380/85R34

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14-34

16.9/14-34

16.9-34

16.9R34

420/85R34

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15-34

18.4/15-34

18.4-34

18.4R34

460/85R34

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18-34

20.8/18-34

20.8-34

20.8R34

520/85R34

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23.1-34

23.1R34

 

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11-36

12.4/11-36

12.4-36

12.4R36

320/85R36

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12-36

13.6/12-36

13.6-36

13.6R36

340/85R36

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10-38

11.2/10-38

11.2-38

11.2R38

280/85R38

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11-38

12.4/11-38

12.4-38

12.4R38

320/85R38

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12-38

13.6/12-38

13.6-38

13.6R38

340/85R38

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13-38

14.9/13-38

14.9-38

14.9R38

380/85R38

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15.5-38

15.5R38

 

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14-38

16.9/14-38

16.9-38

16.9R38

420/85R38

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15-38

18.4/15-38

18.4-38

18.4R38

460/85R38

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18-38

20.8/18-38

20.8-38

20.8R38

520/85R38

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9.5-40

9.5R40

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18.4-42

18.4R42

480/80R42

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20.8-42

20.8R42

520/85R42

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9.5-44

9.5R44

230/95R44

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14.9-46

14.9R46

380/90R46

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18.4-46

18.4R46

480/80R46

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20.8-46

20.8R46

520/85R46

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18.4-50

18.4R50

480/80R50

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