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Industrial tire sizes


Understanding Tractor Tire Sizes Rim Guard Tractor Tires

It is straight-forward to look for the number on the sidewall of your tire when searching for your tractor tire size. Understanding tractor tire sizes, however, requires breaking down the jargon on your sidewall. Tractor tire sizes are indicated using both standard and metric formats. The indications on your sidewall matter replacing your tires, and also when inquiring about the amount of beet juice tire ballast needed for your specific tire size. We get inquiries for the amount of ballast needed for countless tire sizes. As a result, we have been conducting research to obtain a better understanding of tractor tire sizes and thought it would be helpful to share the information we have found with you.

Standard

Standard tire sizes are the easier of the two measurements to read. An example is “16.9 – 30”. Here, “16.9” indicates the width of the tire in inches and “30” indicates the tire will fit a wheel that is 30 inches in diameter. The “-” indicates the tire is bias-ply design. A standard tire size replacing the “-” with an “R” indicates the tire is radial design. To clarify, radial and bias-ply designs will be explained later on. Some standard sizes include the tire width. An example of what this would look like is “27 x 8.5 – 15” with “8.5” indicating the width of the tire in inches.

Metric

Next, is the metric format. Sizes like “380/70R24” are metric and found on most modern tires. Firstly, “380” indicates the width of the tire in mm. Secondly, the “70” indicates the Aspect Ratio of the tire. Width multiplied by aspect ratio gives sidewall height, so (380 x 70% = 266). Therefore, sidewall height of this tire is 266mm. “R” means the tire is radial. Lastly, “24” is the rim diameter in inches.

Radial

Tire sizes containing “R” are radial. Radial tires contain an embedded structure around the circumference of the tire. Radial treads flex independently from the sidewall. Therefore, allowing for more traction, even tread wear, and less of a footprint left in the field.

Bias-Ply

Tire sizes containing “-” are bias-ply. Bias ply tires contain multiple overlapping layers at an angle of 30-45 degrees to the tread line. Bias ply tires are stiff, so they are less prone to puncture when navigating over rough ground.

Load Index

Load index is a method to report load carrying capacity of a tire relative to its speed rating. In our example “125” is the load index rating. So, “125” means there is a capacity of 3640 pounds. Check out more load index values here Load Index Chart

Speed Index

Speed index indicates the speed a tire can travel when carrying a particular load. In reference to our example, the speed index is “A8” meaning the maximum speed it’s designed to run is 25 MPH. See the full list of values on our Speed Index Chart

Tread Style

Different jobs call for different styles of tread. Whether you are using your tractor for mowing or pulling implements in the field, there are various tread styles to help yield the best results. The tread style in our sample reference, “R1”, is arguably the most popular. These treads are versatile and perform well in mud, dirt and fields. View an expanded list of the most popular tread styles in agriculture Tractor Tread Style Chart

Wrap-Up

We hope this helps you decode the jargon on your sidewall. If there are any areas we are missing, feel free to let us know! Our goal with this research is to determine how much beet juice is needed to fill every tire. Interested in inquiring about our beet juice tire ballast? We can help you find your nearest dealer by filling out the form on our webpage, or by emailing [email protected]

 

Tractor Tire Sizes | Ken Jones Tires

How to Read a Tractor Tire Size

 

  1. Locate your tire size on the sidewall of the tire (see picture above).
  2. The first number(16.9) represents the tire width sidewall to sidewall in inches.
  3. The second number(30) represents the rim diameter in inches.

How to Read a Metric Tractor Tire Size

 

Metric Size Conversion Example: Tire Size – 280/85R24

 

Metric Tractor Tire Size Conversion
  1. Locate your tire size on the sidewall of the tire.
  2. The first number represents the overall WIDTH when mounted and inflated to the proper air pressure but it is measured in millimeters. Divide this number by 25.4 to convert to inches. This will become the second number for a traditional tractor tire size.
  3. The second number represents the aspect ratio to the width of the tire (a percentage)HEIGHT when mounted and inflated to proper air pressure but is measured in millimeters. To convert this number to a traditional (inches) tire size, you multiple this number by 2 and divide by 25.4. Then add that number to the wheel diameter. This number now becomes the FIRST number in a traditional size.
  4. The “R” represents that the tire uses radial construction.
  5. The third number represents the diameter of the wheel this tire will mount on.

Standard, Radial, and Metric Tractor Tire Sizes

Tractor tire sizes can be written in many different formats. Sometimes you will see a size written like 11.2×24 or you may see it like 11.2-24. Use the table below to help you find radial tire size equivalents and metric conversions. If you have any questions, just give us a call at 1-800-225-9513, or email us.
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Tractor Tire Size Conversion Chart

 

  Standard Size

  Radial Size

  Metric Size
11.2X20 11.2R20 280/85R20
12.4X20 12.4R20 320/85R20
9. 5X24 9.5R24 250/85R24
11.2X24 11.2R24 280/85R24
12.4X24 12.4R24 320/85R24
13.6X24 13.6R24 340/85R24
14.9X24 14.9R24 380/85R24
16.9X24 16.9R24 420/85R24
18.4X26 18.4R26 420/85R26
11.2X28 11.2R28 280/85R28
12.4X28 12.4R28 320/85R28
13.6X28 13.6R28 340/85R28
14.9X28 14.9R28 380/85R28
16.9X28 16.9R28 420/85R28
14.9X30 14.9R30 380/85R30
16.9X30 16.9R30 420/85R30
420/90R30
18.4X30 18.4R30 460/85R30
12.4X32 12.4R32 320/85R32
12. 4X34 12.4R34 320/85R34
14.9X34 14.9R34 380/85R34
16.9X34 16.9R34 420/85R34
18.4X34 18.4R34 460/85R34
20.8X34 20.8R34 520/85R34
12.4X36 12.4R36 320/85R36
13.6X36 13.6R36 340/85R36
13.6X38 13.6R38 340/85R38
14.9X38 14.9R38 380/85R38
16.9X38 16.9R38 420/85R38
18.4X38 18.4R38 460/85R38
20.8X38 20.8R38 520/85R38
18.4X42 18.4R42 460/85R42
20.8X42 20.8R42 520/85R42
20.8X46 20.8R46 520/85R46

 

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Special tires and wheels

Small tires for horticulture and agriculture

  • - small tires for indoor use
  • - lawn mower tire
  • - tires with tractor pattern
  • - tires for tedders, mowers, etc.

The diameter and section width dimensions indicate the maximum diameter and width, including the possible expansion of the tire during operation. Dimensions refer to tires fitted to the recommended wheel size. The tolerances for these dimensions are +7/-4%.

Translation - tire sizes
180×45 7×1 3/4
200×35 8×1 1/4
200×50 8×2
220×50 8 1/2×2
2.50-3 210×65 8×2.5
3.00-4 260×85 10×3
4.00-4 12×4
2.00-6 10×2
3.50-6 13×3
4.00-6 14×4
2.25-8 12. 5×2.25 12 1/2×2 1/4
4.00-8 400×100 16×4
5.00-8 18×5
6.00-9 21x6
18×8.00-10 195/50-10
20.5×10.00-10 255/50-10
24×8.00-14.5 200/60-14.5

Tire designation
The size Explanation
3.00-4 Our designation:
Tire Width 3.00″ — Wheel Diameter 4″
10×3 Former designation in inches:
3″ tire width - 10″ tire diameter (= 3″ x 2 + 4″)
260×85 Designation in millimeters:
tire diameter 260 mm. — tire width 85 mm.
The former designation in inches is converted to mm.:
10″ x 25.4 = approx. 260 mm.
3″ x 25.4 = approx. 85 mm.
85/100-4 This is what the designation would look like if it were on a car tire:
Bar Width 85mm - 100% Profile - 4″ Diameter
10×3.00-4 94.50-124.50-164.80-85.00-85.00R85.00-125.00-155.00-165.0-105.50-155.50-165.70-126.00-96.00-166.00-126.00-146.00R96.00-156.5/7 156.5/90-126.5/90-156.50-106.50R106.50-166.50-206.70-156.90-127.00-147.00-167.00R127.00-157.00R157.50-107.50-157.57.57.57.50R167.50-187.57.57.57.57.57.57.57.57.57.5EN R187.50-207.50R207.5L-157.60-158.00-16.58.00-168.00-188.00-208.15-158.15R158.25-128.25-158.25R158.25-208.3-208.3-228.3-248.3-365 158.75-16.59.00-169.00-209.00R209.50/65-159.5R209.5-189.5-169.50-16.59.5-209.5-229.5-249.5R249.5R289.5-329.5R329.5-369.5R369.5R409.5-429.5R429.5R449. 5R489.5L-149.5L-1510-16.510.0/75-15.310.0/ 75r15.310.0/80-1210.00-1510.00-1610.00-2010.00R1510.00R2010.5/65-1610.5/80-1610.5/80-1810.5-1810.5-2010.5r1810.5R2011x4.00-1611 -2011.2-2411.2-2611.2R2411.2-2811.2R2811.2R3211.2R3611.2R3811.2R4211.2R4411.2R4611.2R4811.2R5411.0/65-1211.5/80-15.311L-1411L-1511L-1611LR1612-16.512.0/ 75-1812.0-1812.00-2012.00R2012.00-2412.00R24250/60-1232x12.50-15350-15385/95-2427x8.5-1512.4R2012.4-2012.4-2412.4R2412.4-2812.4R2812.4-3212.4R3212.4-3612.4R3612.4-3812.4R3812.4R4612.4R5012.4R5212.5.5/8012.4 5/80-1812.5/70-1612.5-1812.5R1812.5-2012.5R2012.5L-1512.5L-1613x5.00-613.0/55-1613.0/65-1813.0/75-1613.00-2413.6-1613.6R2413.6-2 2613.6-2813.6R2813.6-3613.6R3613.6-3813.6R3813.6R4613.6R4813/80R2014.0/65-1614.00-2014.00R2014.00-2414.00R2414.00-2514.00R251 1814L-16.114.5-2014.5R2014.9/80-2414.9LR2014.9-2414.9R2414.9-2614.9-2814.9R2814.9-3014.9R3014.9R3414.9R5014-17.514.0/70-2015x6.00-615.0/55-1715.0/70-1815.00R2415.5/60-1815.5/70-1815.5/65-1815.5/80-2415.5/80R2415.5 -3815. 5R2515-19.515x4.5-816.0/70-2016.0/70-2416.0/70R2416.0/70R2016.00R2016.00-2416.00-2516.00R2416.00R2516.5/85-2416.5R29.216L-16.116.0 R2416.9-2616.9-2816.9R2816.9-3016.9R3016.9-3416.9R3416.9-3816.9R3816x6-816x6.50-817.5/65-2017.5L-2417.5LR2417.5-2517.5R2018.00 00R3318.4-2418.4-2618.4R2618.4-2818.4-3018.4R3018.4-3418.4R3418.4-3818.4R3818.4R4218.4R4618.4R5018-19.518-22.518R22.518x7-818x8.5-818x9.50-819.0/45-1719.5L-2419.5LR2419.5LR2819.5LR3019.5LR3419.5LR3820x10.00-1020x10-820-2420x12.00-20252.5-20252.5 /70-1620.8-3820.8r3820.8R4220.8RP4621.00-2521.00R2521.00R3321.00-3521.00R3521.3-2421.5L-16.121L-2421L-2821x8-922/70-2423.1-2623.5-223X11111111111111111111111111AR23X111111111111111T -1223x10.50-1223x12-1223x9-1024.00-3524.00R3524x8.00-14.524.5-3224.5R3224.5R3824.5R4225x8.5-1426.5-2526.5R2526x12-1226x12-16.526.5x14.00-1227.00-4927.00R4927x10.5-1527x10 -1227x8.50-1528L-2628LR2628x12.5-1528x9-1528x9R1529.5-2529.5R2529.5-2929.5R2929x12.5-1530.5L-3230.5LR3230/65R2531x10-2031x13.50-1531x15.50-1531. 5x13-16.532x12.1-1533.00-5133.00R5133.25-2933x12-2033x12. 50-1533x15.5-1533x15.5-16.535.5L-3235.5R3235/65R2935/65-3335/65R3336.00-5136x14-2040.00-5740/65-3944x18.00-245/65-4545/65R3946 -25125/75-8140/55-9150/100-13150/75-8160/90-13180/60-10180/70-8180/70R8185/65-15200/60-14.5200/75-9200/50-10205/50 -10205/60-15210/70R15210/95R16210/95R32210/95R44215/75-17.5220/70R16225/75-10225/75-15225/75-17.5225/75R10225/75R15230/95-24230/95-32230/95R32230/95R36230/95R40230/95R42230/95R44230/95R48240/70R16250-15250/65-14.5250/70-15250/70R152250/75R1225/80-1825/85r25/85r25/85r25r 15.3260/75-15.3260/70R15.3260/70R16260/70R16.5270/65-16.5265/70-16.5270/65R16270/65R18270/80R32270/85-28270/95-20270/95R32270/95R36270/95R38270/95R42270/95R44270/95R46270/ 95R48270/95R54275/80-20275/90R22.5280/60-15.5280/70R15280/70R16280/70R18280/70R20280/75R22.5280/80-18280/80R18280/80-20280/80R20280/85R20280/85R24280/85R28290/95-20290/ 95r20300-15300/40-16.5300/65-12300/70R16.5300/70R20300/80-15.3300/85R42300/95-20300/95R20300/95R46300/95R52305/60-12305/70-16. 5305/70R16.5310-15310/80R222. 5315/50-15315/70-15315/70R15315/70-22.5315/85-15320/65R16320/70-16.5320/70R20320/70R24320/80-15.3320/80-18320/85-24320/85-2822 85R20320/85R24320/85R28320/85R32320/85R34320/85R36320/85R38320/90R42320/90R46320/95R46320/90R50320/90R54330/95-20330/95R20335/80-20335/80R18335/80R20340/55-16340/60R16.5340/65R18340/65R20340/ 75R20340/80-18340/80-20340/80R18340/80R20340/80R24340/85-28340/85-36340/85-38340/85R24340/85R28340/85R36340/85R38340/85R485R8400R48355/45-15355/50-15355/50-20355/65-15355/80-18355/85-24360/70R17.5360/70R18360/70R20360/70R24360/70R28360/80-20360/85-20365 20365/80r20375/75r20380/55-17380/55R16.5380/70R20380/70R24380/70R28380/75-20380/75R20380/80R38380/85-24380/85-28380/85-3-038380/8538380/8538380/8538380/8538380/8538380/8538380/8538380/8538380/8538380/8538380/853880/838880/838880/838880/838880/838880/838880/838880/83880/83880/83880/ 85r34380/85R38380/90R46380/90R50380/90R54380/95R38380/105R50385/65-22.5385/65R22.5385/95R24385/95R25395/85R20400/55-22. 5400/60-22.5400/60.5400/60/62.5400/60/62.5400/60/62.5400/60/62.5400/60.5400/60.5400/60.5400/ 24405/75-20400/70-18400/70R18400/70R20400/70R24400/75-38400/80-24400/80R24400/80R28405/70-20400/45L17.5405/70-24405/70r18405/70r20405/70r24-1420/5 65r20420/65R24420/70R24420/70R28420/70R30420/75R20420/80-30420/80R46420/85-24420/85-26420/85-28420/85-30420/85-34420/85-38420/85r24420/85r26420/85r330/85r330 85R34420/85R38420/90R30420/95R50425/55R17425/75R20440/50R17440/55R18440/65R24440/65R28440/70R28440/80-24440/80R24440/80-28440/80R28440/80-30440/80R30750/70R44440/80R34445/65-22.5445/65R22.5445/70- 24445/70-19.5445/70R19.5445/70R22.5445/70R24445/95R25450/95R25460/65R22.5460/70-24460/70R24460/85-26460/85-30460/85-34460/85-38460/85R26460/85R30460/ 85R34460/85R38480/45-17480/60R28480/65R24480/65R28480/70R24480/70R28480/70R30480/70R34480/70R38480/80-26480/80R26480/80R38480/80R42480/80R46480/80R50480/65-22.5480/95R25480/95R50495/70R24500/45-20500/45-22.5500/45R22.5500/50-17500/50-22.5500/50R17500/55-20500/60-15.

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