MICHELIN Truck and Bus Tyres are engineered for Multi-Life = Regroovable and Retreadable!

More Mileage: save 1 tyre every 4 !

Regrooving is carried out at a time when the original tread depth has 3 to 4 mm. remaining and the tyre is normally removed. Regrooving restores tread depth thus providing up to 25% more kilometers.

More Safety through grip regeneration

Regrooving significantly renews the grip of the tyre through the regeneration of the groove up to 4 mm. beyond the original bottom of the groove.

Less Fuel Consumption and less CO₂ emissions

Regrooving is carried out in the phase when the tyre has the lowest rolling resistance due to higher rigidity of the shallow tread pattern, and Low Rolling Resistance means increased Fuel Efficiency.

Less Raw Materials Consumption to preserve the environment

By adding only 5% additional rubber volume when the tyre is new, a MICHELIN Regroovable tyre will add up to 25% more kilometres which creates a 16% reduction in raw materials when compared to non-regroovable tyres.

Regrooving Q & A

Why does a REGROOVED tyre last longer?
A regrooved tyre can restore up to 4 mm. of tread depth. That can be as much as 25% of the original tread depth.

Why does a REGROOVED tyre consume less fuel?
Tyres become more fuel efficient at approximately the last 30% of tyre life because their rolling resistance goes down during this period. Rolling resistance is a measure of force required to get the truck moving and keep it rolling. The difference in rolling resistance between new and the last 1/3 of tyre life is about 25%. This equates to 4-6% improvement in fuel economy!

Now, combine Fact 1 and Fact 2 together and you extend the time that the tyre operates in this optimum rolling resistance period. So instead of achieving the best fuel economy for only 30% of the tyre life, you can extend it to 40% of the tyre life just by REGROOVING!

How does the REGROOVE tyre enhance my grip?
A tyre’s grip is determined by many factors such as rubber compounds used, the tread pattern, foot print size, and the ability to evacuate water from under the contact patch. As the tyre wears down, the ability to evacuate water also goes down. By restoring the main rain grooves up to 4 mm., you also restore the ability to channel the water out and away from the footprint.

Regrooving can also restore some of the lateral grooves that get worn away towards the end of tyre life. This provides new biting edges thus regaining grip performance lost when a tyre wears down.

How can REGROOVING tyres help the environment?
To improve the tyres impact on the environment, we need to reduce the amount of CO2 production. We know from studies that 5% of CO2 production comes from the manufacture of new tyres in the form of raw materials, energy used for production and distribution. These studies also reveal that 93.5% of CO2 production comes during the trucks operational period in the form of fuel consumed.

Simply put, if we can make the tyre last longer and get better fuel economy, we can reduce the CO2 produced! REGROOVING your tyres accomplishes both of these goals.
• Up to 25% improvement in tyre life
• 4-6% improvement in fuel efficiency when compared to the start of tyre life.
• Extends the operational time of the tyres peak fuel efficiency.

If REGROOVING adds up to 4 mm. of tread depth, why not just build the tyre with 4 mm. more tread at the beginning?
If you add the tread depth at the beginning of life, you increase the heat generation of the tyre. Heat is the main enemy of a tyre and creates a negative impact on casing fatigue and fuel efficiency. The wear rate is also affected because taller tyres produce more slippage as the tread exits the contact patch causing a faster wear rate.

By engineering the tyre with the ability to REGROOVE, you can gain the advantages of adding up to 4 mm. of tread without any of the adverse effects mentioned above.

For more information, please contact your nearest Michelin Service Centre on 1300 72 7878 or by clicking here.

Regrooving is carried out in the phase in which the tyre has the lowest rolling resistance.

As a worn tyre has less rubber deformation in the tread pattern, it generates less heat and so offers lower rolling resistance and uses less fuel.

For given driving conditions and on a straight road, if the rolling resistance is 100 for a new tyre, it becomes 75 for a tyre worn to the tread wear indicators. Between these two extremes, the rolling resistance is proportional to the wear.
For a tractor and semi trailer vehicle combination used for long-distance haulage, the fuel saved by regrooving the tyres instead of fitting new tyres can reach 2 liters per 100 kms (depending to the number of axles equipped).

This decrease in fuel consumption due to the lower rolling resistance is COMBINED with the increase in total tread mileage shown in the previous section.

Regrooving Recommendations

Carry out the regrooving when there is still 2 to 4 mm of tread

This precaution makes it possible to:
- Reproduce the tread pattern easily.
- Adjust the regrooving depth so as to always keep at least
2 millimeters of compound between the bottom of the tread pattern and the crown layers.

If Regrooving is too deep:

- Result in damage that causes the premature destruction of the casing.
- Compromise the possibility of retreading.
- Allow metal layers of the crown to appear, which may reduce the life of the casing.

Regrooving is not recommended:

If the tread shows major damage:
- Multiple holes and cuts, places where the tread has been torn off.
- If the metal layers of the crown can be seen through damage or cuts.

It is essential that the regrooving be carried out by professtionals in accordance with our recommended rules.

Please consult your Michelin representative or Michelin dealer for more details.