Proof of performance

Michelin engineers develop and implement rigorous tests to measure the performance of your agricultural tyres – they are your productivity allies. They work with agronomy experts recognized for the rigor of their methodology. In addition, before every tractor tyre range is taken to market, it undergoes long-term placement on farms selected for the intensity of their activity.

Reduced soil compaction

Surface and depth of the imprint area surface

How is it done?

A sand track is a means of comparing agricultural tyres in a highly analytical, reproducible manner, which is difficult to do in the middle of a field due to the  difficulty of controlling the initial soil condition, the levels of pre-compaction and humidity. A significant difference between two agricultural tyres identified on sand will be reflected in the same way on farm soil. During the analysis, the test was repeated several times to ensure consistent measurements.

What are the results?
Mtge_Schema_Pneus_V02_EN_optimise

The test enables the surface area of the tractor wheel tyre's footprint and the depth of rut depth to be measured.

According to the example opposite, the test showed that the MICHELIN® XeoBib tyre has a footprint 24% larger in area than that of a classic technology tyre, as well as a 55% shallower rut depth.

Measurement of ruts and effect on depth

How is it done?

A ditch is dug and then filled with layers of soil of alternate colours. The farm equipment, equipped with the agricultural tyres to be tested rolls over this ditch.

After the pass, a trench is dug perpendicular to the tyre tracks.  The deformation of the layers of soil can then be measured and analysed (from a quality and quantity aspect).

What are the results?

This test has enabled us to observe that use of a MICHELIN tyre with Ultraflex technology reduced soil compaction by close to 20% compared with a competitor* tyre.

The consequences of ruts and compaction on the quality of the soil are measured by the penetrometry test.

Conducted by engineers and agronomy experts, these tests explore rut formation, footprint surface and depth, penetration test, wear testing, fuel consumption, etc.

Measurement of soil compaction

How is it done?

The penetrometry test is conducted out in the field.  The machine, fitted with the agricultural tyres to be tested, rolls over the   test zone.

After the pass, measurements are taken at various points at regular intervals along the track left by the tractor wheel. Soil compaction is measured at different depths with a penetrometer.

What are the results?
Graph1_EN_V02_optimise

These measurements enable compaction of the soil to be measured after the pass of the machine equipped with the tyres to be tested.

In the example above, after the pass of an agricultural farm machinery machine  equipped withMICHELIN CerexBib tyres, the soil quality remains at a level considered as good for the development of roots (see graph – source Wright Resolutions) whereas after the same machine equipped with competitor ag tyres has run over the soil, the limit threshold for good growth of crops is exceeded, which negatively affects soil protection.

Fuel saving

How is it done?

The test is conducted in an actual soil preparation situation and calls for maximum use of the tractor output. On a plot of land with uniform soil the tractor has a tooth plough attached and covers a predetermined distance. The exercise is repeated usingwith the various tractor tyres to be compared mounted.

Since the traction effort is identical on each pass, the spin and therefore the fuel consumption will enable several tyre solutions to be differentiated (to refine the test further, an effort sensor installed between the tractor and attached plough permanently measures the traction force).

Conducted by engineers and agronomy experts, these tests explore rut formation, footprint surface and depth, penetration test, wear testing, fuel consumption, etc.

Fuel consumption is measured by means of a system set up on the fuel supply circuit.

What are the results?
Conducted by engineers and agronomy experts, these tests explore rut formation, footprint surface and depth, penetration test, wear testing, fuel consumption, etc.

MICHELIN Ultraflex technology tyres are able to function at lower pressures (but still in compliance with our recommendations). This reduction in pressure permits a larger footprint and results in better traction of the tractor wheel.

Result : a high reduction in the rate of slip and better fuel economy.

Long service life

How is it done?
Conducted by engineers and agronomy experts, these tests explore rut formation, footprint surface and depth, penetration test, wear testing, fuel consumption, etc.

The accelerated wear test is based on actual rolling conditions and is carried out without a driver 24 hours a day. The implementation protocol integrates speed variation and the simulation of various kinds of use.

What are the results?

An analysis is made of the condition of the agricultural tyre tread after the test.

This test enables a very accurate comparison to be made of tyres of a different type, range or composition by analysing the condition of the tread and wear at each point on the  tread.

These results are then consolidated by means of tyre usage on farms.