Tools » Conversion table
Conversion table
| GENERAL FARM TIRE INFORMATION | |||||||
| III. TIRE COMPARISON CONVENTIONAL VS. METRIC | |||||||
| STD NOWRAP | NARROW | 90/95 | 80/85 | 70/75 | 65 | LARGE/ LOW PRESS | FLOTATION |
| 650R16 | 260/70R16 | ||||||
| 7.50R16 | 260/70R16 | 320/65R16 | 11LR16 | ||||
| 280/70R16 | |||||||
| 7.50R18 | 260/70R18 | 320/65R18 | |||||
| 280/70R18 | |||||||
| 7.50R20 | 260/70R20 | 320/65R18 | |||||
| 280/70R20 | |||||||
| 10.5R18 | 300/70R18 | 340/65R18 | 275/80R18 | ||||
| 9.5R20 | 240/85R20 | 300/70R20 | 275/80R20 | ||||
| 310/70R20 | |||||||
| 11.2R20 | 320/70R20 | ||||||
| 12.4R20 | 320/85R20 | 360/70R20 | 420/65R20 | 335/80R20 | |||
| 13.6R20 | 380/70R20 | ||||||
| 8.3R24 | 220/85R24 | 375/75R20 | |||||
| 9.5R24 | 240/85R24 | 405/70R20 | |||||
| 11.2R24 | 280/85R24 | 320/70R24 | 420/65R20 | 425/75R20 | |||
| 12.4R24 | 8.3R22 | 320/85R24 | 360/70R24 | 420/65R24 | 425/75R20 | ||
| 13.6R24 | 8.3R32 | 210/95R32 | 340/85R24 | 380/70R24 | 440/65R24 | 445/70R24 | 42x25.00-20 |
| 400/70R24 | |||||||
| 14.9R24 | 8.3R32 | 230/95R32 | 380/85R24 | 420/70R24 | 480/65R24 | 17.5LR24 | |
| 9.5R32 | 380/85R34 | 460/70R24 | |||||
| 16.9R24 | 9.5R32 | 270/95R32 | 420/85R24 | 480/70R24 | 540/65R24 | 19.5LR24 | 48x25.00-20 |
| 11.2R32 | 210/95R36 | ||||||
| 9.5R36 | 230/95R36 | ||||||
| 14.9R26 | 11.2R32 | 210/95R36 | 440/65R28 | ||||
| 16.9R26 | 11.2R32 | 210/95R36 | 420/85R26 | 480/70R26 | 540/65R26 | ||
| 18.4R26 | 11.2R36 | 180/95R40 | 460/85R26 | 520/70R26 | 580/70R26 | ||
| 9.5R40 | |||||||
| 11.2R38 | |||||||
| 9.5R28 | |||||||
| 11.2R28 | 320/70R28 | 42x25.00-20 | |||||
| 12.4R28 | 9.5R32 | 230/95R32 | 320/85R28 | 360/70R28 | 420/65R28 | 480/65R24 | |
| 17.5LR24 | |||||||
| 13.6R28 | 9.5R32 | 270/95R32 | 340/85R28 | 380/70R28 | 440/65R28 | 540/65R24 | 48x25.00-20 |
| 11.2R32 | 210/95R36 | 19.5LR24 | |||||
| 14.9R28 | 11.2R32 | 230/95R36 | 380/85R28 | 420/70R28 | 480/65R28 | 48x31.00-20 | |
| 9.5R36 | 210/95R36 | 480/70R26 | |||||
| 180/95R40 | |||||||
| 16.9R28 | 9.5R36 | 290/95R34 | 420/85R28 | 480/70R28 | 540/65R28 | 580/70R26 | 800/50-25 |
| 11.2R36 | 320/95R34 | 320/85R34 | 520/70R26 | 54x31.00-25L | |||
| 11.2R38 | 270/95R36 | ||||||
| 230/95R40 | |||||||
| 14.9R30 | 9.5R36 | 180/95R40 | 380/85R30 | 420/70R30 | |||
| 11.2R36 | |||||||
| 11.2R38 | |||||||
| 16.9R30 | 11.2R36 | 270/95R38 | 420/85R30 | 480/70R30 | 540/65R30 | 600/65R28 | 54x37.00-25 |
| 9.5R40 | 420/90R30 | 320/85R36 | 600/65R28 | 620/70R26 | |||
| 11.2R38 | 230/95R40 | ||||||
| 180/95R40 | |||||||
| 18.4R30 | 210/95R44 | 460/85R30 | 520/70R30 | 600/65R28 | |||
| 320/85R38 | |||||||
| 340/85R36 | |||||||
| 385/85R34 | |||||||
| 12.4R32 | 11.2R32 | 210/95R36 | |||||
| 9.5R36 | |||||||
| 24.5R32 | 650/75R32 | ||||||
| 30.5LR32 | 800/65R32 | ||||||
| 16.9R34 | 8.3R44 | 320/90R42 | 420/85R34 | 480/70R34 | 540/65R34 | 600/65R32 | |
| 9.5R44 | 230/95R44 | 340/85R38 | 500/70R34 | 1000/50R25 | |||
| 380/80R38 | 750/65R26 | ||||||
| 600/70R28 | |||||||
| 18.4R34 | 9.5R44 | 320/90R42 | 460/85R34 | 520/70R34 | 600/65R34 | 620/75R30 | 66x43.00-25 |
| 11.2R44 | 230/95R48 | 600/70R30 | 66x44.00-25 | ||||
| 9.5R48 | 270/95R44 | 1050/50R25 | |||||
| 13.6R36 | 11.2R38 | ||||||
| 9.5R40 | |||||||
| 8.3R44 | |||||||
| 13.6R38 | 11.2R38 | ||||||
| 9.5R40 | |||||||
| 8.3R44 | |||||||
| 9.5R44 | |||||||
| 15.5R38 | 8.3R44 | 540/65R34 | |||||
| 9.5R44 | |||||||
| 16.9R38 | 11.2R44 | 320/90R42 | 420/85R38 | 480/70R38 | 540/65R38 | 23.1R30 | 66x43.00-25 |
| 9.5R48 | 230/95R48 | 620/75R30 | 67x34.00-25 | ||||
| 230/95R38 | |||||||
| 18.4R38 | 12.4R46 | 320/90R46 | 460/85R38 | 520/70R38 | 600/65R38 | 650/75R32 | 68x50.00-32 |
| 11.2R48 | 300/95R46 | 480/80R38 | |||||
| 270/95R48 | |||||||
| 20.8R38 | 12.4R52 | 380/90R46 | 420/85R38 | 580/70R38 | 650/65R38 | 800/65R32 | 73x44.00-32 |
| 320/90R50 | 520/85R38 | 650/75R34 | |||||
| 300/95R52 | 680/75R32 | ||||||
| 320/90R54 | 1050/50R32 | ||||||
| 620/75R34 | |||||||
| 620/70R38 | |||||||
| 18.4R42 | 480/80R42 | ||||||
| 20.8R42 | 12.4R54 | 320/90R54 | 520/85R42 | 580/70R42 | 650/65R42 | 710/70R38 | 78x45.00-32 |
| 270/95R54 | 620/70R42 | 710/70R34 | 76x50.00-32 | ||||
| 380/90R50 | 900/50R42 | ||||||
| 710/75R34 | |||||||
| 16.9R46 | 420/80R46 | ||||||
| 18.4R46 | 480/80R46 | ||||||
| 20.8R46 | 520/85R46 | 710/70R42 | 800/70R38 | ||||
| 18.4R50 | 380/90R54 | 480/80R50 | |||||
| MILLIMETRIC SIZE TIRES | |||||||
| The marking of some farm tires are millimetric | |||||||
| and the service description is load index and | |||||||
| speed symbol. This marking conforms to what is | |||||||
| currently used for passenger, truck, | |||||||
| agricultural and earth-mover tires. | |||||||
| EXAMPLE: TIRE SIZE: 710/70R-38 166A8 | |||||||
| “710” tire section width in millimeters | |||||||
| “70” aspect ratio | |||||||
| > “R” radial construction | |||||||
| 38 rim diameter in inches | |||||||
| “166” load index | |||||||
| > “A8” speed symbol | |||||||
| 1 inch = 25.4 millimeters = 2.54 centimeters | |||||||
| 1 foot = 30.48 centimeters = .3048 meters | |||||||
| 1 mile = 1609.3 meters = 1.6093 kilometers | |||||||
| 1 mile = 5280 feet = 1760 yards | |||||||
| 1 square inch = 6.4516 square centimeters | |||||||
| 1 square foot = 144 square inches | |||||||
| 1 square yard = 9 square feet | |||||||
| 1 square mile = 640 acres | |||||||
| 1 hectare = 2.471 acres | |||||||
| 1 gallon water = 8.3453 pounds of water | |||||||
| 1 U.S. gallon = 3.785 liters | |||||||
| 1 peck = 8 quarts (dry) | |||||||
| 1 bushel = 4 pecks (U.S.) | |||||||
| 1 lbm = .4536 kilogram | |||||||
| 1 lbf = 4.45 Newtons | |||||||
| 1 psi = 6.895 kilopascal (kPa) = .06895 bar | |||||||
| INTERNATIONAL | |||||||
| SPEED SYMBOLS | |||||||
| Speed Symbols | |||||||
| A1 | |||||||
| A2 | |||||||
| A3 | |||||||
| A4 | |||||||
| A5 | |||||||
| A6 | |||||||
| A7 | |||||||
| A8 | |||||||
| B | |||||||
| C | |||||||
| D | |||||||
| E | |||||||
| E | |||||||
| F | |||||||
| G | |||||||
