VF, IF, NRO, A8, 460 / 85 R 34... These series of digits and letters are not always easy to understand, but they are very important and by not understanding them you can make mistakes which could have serious financial consequences, as you may have to replace an axle earlier than planned, which would reduce your results.
So, what do these indications really mean and are they so important? To find out, here are all the secrets that your tractor tyres have been hiding:
These indications help you to work more effectively, they guide you towards optimum use of your tyres. By complying with the load index for agricultural tyres you will increase their lifespan, by complying with the speed rating you will avoid accidents, by being aware of the manufacturing year you can better estimate the date on which your tyres will need to be replaced, etc.
The size indications can vary depending on various criteria: expressed in inches or in millimetres, different depending on the size of the rim, the width of the tyre or the series.
For example:
16.9 R 30 or 480/70 R 30
or 18.4 R 34 or 460/85 R 34
The figures with a decimal point 16.9 or 18.4 represent the cross-section width (distance between the left sidewall and the right sidewall of the same tyre) expressed in inches (1 inch = 25.4 mm). If the distance is indicated in inches this shows either that your tyre is old, or that it doesn’t come from Europe.
The figures 480 or 460 represent the same thing, the tyre’s cross-section width (distance between the left sidewall and the right sidewall of the same tyre) in millimetres (more likely on recent tyres).
Using the same example:
16.9 R 30 or 480/70 R 30 or 18.4 R 34 or 460/85 R 34
The figures 30 or 34 represent the size of the sidewall in inches (1 inch = 25.4 mm).
This corresponds to the height of the tyre sidewall.
Using the same example:
16.9 R 30 or 480/70 R 30 or 18.4 R 34 or 460/85 R 34
The figures 70 or 85 represent the series expressed in percent.
This is the ratio between the height of the sidewall and the cross-section width, the following series exist: 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105.
Using the same example:
16.9 R 30 or 480/70 R 30 or 18.4 R 34 or 460/85 R 34
The letter R corresponds to a RADIAL agricultural tyre structure.
When there is a D, or if there is no letter indication, the tyre has a diagonal structure.
This is a maximum load reference for a pressure of 1.6 bar and often associated with a speed rating. The load indexes are generally expressed from 100 to 200.
For example:
Be aware that you can work with different pressure levels than 1.6 bar, which will have different implications on the maximum load. One tyre can have several load indexes, each one associated with a different speed rating.
The speed rating is indicated either with a letter alone or with a letter and a figure, it corresponds to the maximum speed for a maximum load index.
For example:
Be aware that you can work with different pressure levels than 1.6 bar which will have different implications on speed depending on the maximum load.
The date indication is a series of 4 figures, they are very useful if buying second-hand tyres.
For example:
4012 or 1012 or 3010 or 1595 ...
The first two figures indicate the week number and the next two, the year itself.
For 4012, the tyre was made in the fortieth week of the year 2012,
for 3010, it was the thirtieth week of the year 2010…
Some indications inform you about the tyre quality or the mounting possibilities.
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