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 |
|
|
|
|
12.4-20 |
12.4R20 |
320/85R20 |
|
|
8-22 |
8.3/8-22 |
8.3-22 |
8.3R22 |
210/95R22 |
|
|
9-22 |
9.5/9-22 |
9.5-22 |
9.5R22 |
|
|
|
8-24 |
8.3/8-24 |
8.3-24 |
8.3R24 |
|
|
|
9-24 |
9.5/9-24 |
9.5-24 |
9.5R24 |
250/85R24 |
|
|
10-24 |
11.2/10-24 |
11.2-24 |
11.2R24 |
280/85R24 |
|
|
11-24 |
12.4/11-24 |
12.4-24 |
12.4R24 |
320/85R24 |
|
|
12-24 |
13.6/12-24 |
13.6-24 |
13.6R24 |
340/85R24 |
|
|
13-24 |
14.9/13-24 |
14.9-24 |
14.9R24 |
380/85R24 |
|
|
14-24 |
16.9/14-24 |
16.9-24 |
16.9R24 |
420/85R24 |
|
|
|
|
17.5L-24 |
17.5LR-24 |
|
|
|
15-24 |
18.4/15-24 |
18.4-24 |
18.4R24 |
|
|
|
|
|
19.5L-24 |
19.5LR-24 |
|
|
|
|
|
21L-24 |
21LR-24 |
|
|
|
12-26 |
13.6/12-26 |
13.6-26 |
13.6R26 |
|
|
|
13-26 |
14.9/13-26 |
14.9-26 |
14.9R26 |
380/85R26 |
|
|
14-26 |
16.9/14-26 |
16.9-26 |
16.9R26 |
|
|
|
15-26 |
18.4/15-26 |
18.4-26 |
18.4R26 |
420/85R26 |
|
|
|
|
23.1-26 |
23.1R26 |
|
|
|
|
|
28L-26 |
28LR-26 |
750/65R26 |
|
|
9-28 |
9.5/9-28 |
9.5-28 |
|
|
|
|
10-28 |
11.2/10-28 |
11.2-28 |
11.2R28 |
280/85R28 |
|
|
11-28 |
12.4/11-28 |
12.4-28 |
12.4R28 |
320/85R28 |
|
|
12-28 |
13.6/12-28 |
13.6-28 |
13.6R28 |
340/85R28 |
|
|
13-28 |
14.9/12-28 |
14.9-28 |
14.9R28 |
380/85R28 |
|
|
14-28 |
16.9/14-28 |
16.9-28 |
16.9R28 |
420/85R28 |
|
|
15-28 |
18.4/15-28 |
18.4-28 |
18.4R28 |
|
|
|
|
|
7.2-30 |
|
|
|
|
13-30 |
14.9/13-30 |
14.9-30 |
14.9R30 |
380/85R30 |
|
|
14-30 |
16.9/14-30 |
16.9-30 |
16.9R30 |
420/85R30 |
|
|
15-30 |
18.4/15-30 |
18.4-30 |
18.4R30 |
460/85R30 |
|
|
|
|
23.1-30 |
23.1R30 |
620/75R30 |
|
|
9-32 |
9.5/9-32 |
9.5-32 |
9.5R32 |
||
|
11-32 |
12.4/11-32 |
12.4-32 |
12.4R32 |
320/85R32 |
|
|
|
|
24.5-32 |
24.5R32 |
650/75R32 |
|
|
|
|
30.5L-32 |
30.5LR-32 |
800/65R32 |
|
|
11-34 |
12.4/11-34 |
12.4-34 |
12.4R34 |
320/85R34 |
|
|
12-34 |
13.6/12-34 |
13.6-34 |
13.6R34 |
340/85R34 |
|
|
13-34 |
14.9/13-34 |
14.9-34 |
14.9R34 |
380/85R34 |
|
|
14-34 |
16.9/14-34 |
16.9-34 |
16.9R34 |
420/85R34 |
|
|
15-34 |
18.4/15-34 |
18.4-34 |
18.4R34 |
460/85R34 |
|
|
18-34 |
20.8/18-34 |
20.8-34 |
20.8R34 |
520/85R34 |
|
|
|
|
23.1-34 |
23.1R34 |
|
|
|
11-36 |
12.4/11-36 |
12.4-36 |
12.4R36 |
320/85R36 |
|
|
12-36 |
13.6/12-36 |
13.6-36 |
13.6R36 |
340/85R36 |
|
|
10-38 |
11.2/10-38 |
11.2-38 |
11.2R38 |
280/85R38 |
|
|
11-38 |
12.4/11-38 |
12.4-38 |
12.4R38 |
320/85R38 |
|
|
12-38 |
13.6/12-38 |
13.6-38 |
13.6R38 |
340/85R38 |
|
|
13-38 |
14.9/13-38 |
14.9-38 |
14.9R38 |
380/85R38 |
|
|
|
|
15.5-38 |
15.5R38 |
|
|
|
14-38 |
16.9/14-38 |
16.9-38 |
16.9R38 |
420/85R38 |
|
|
15-38 |
18.4/15-38 |
18.4-38 |
18.4R38 |
460/85R38 |
|
|
18-38 |
20.8/18-38 |
20.8-38 |
20.8R38 |
520/85R38 |
|
|
9.5-40 |
9.5R40 |
||||
|
|
|
18.4-42 |
18.4R42 |
480/80R42 |
|
|
|
|
20.8-42 |
20.8R42 |
520/85R42 |
|
|
|
|
9.5-44 |
9.5R44 |
230/95R44 |
|
|
|
|
13.6-46 |
13.6R46 |
320/90R46 |
|
|
|
|
14.9-46 |
14.9R46 |
380/90R46 |
|
|
|
|
18.4-46 |
18.4R46 |
480/80R46 |
|
|
|
|
20.8-46 |
20.8R46 |
520/85R46 |
|
|
|
|
18.4-50 |
18.4R50 |
480/80R50 |