Michelin Tyres

Usage Recommendation

Usage Recommendation

Usage Recommendation

Fitting and removal of Michelin tyres

This must be carried out by trained competent personnel using the correct equipment including lubricant. Incorrect fitting can result in damage to the tyre (may not be visible at the time of fitting), tube or wheel. Tyre fitment must be done following Michelin instructions.

The inflation must be carried out in 2 stages :

1st stage :
  • pre-inflate to 1.5 bar, 22 psi.
  • general inspection of the tyre

The presence of blisters or deformations will necessitate the de-mounting of the tyre to be examined by a tyre specialist.

2nd stage :
  • inflate the tyre to the required pressure.
  • during inflation, the tyre must be placed vertically in an inflation cage or a suitable secure area.

The operator must position himself in line with the tread band during inflation.

Inflation pressure

Tyres for commercial vehicles should be inflated to a pressure relevant to the load, speed and condition of use. Suggested pressures are shown in the load/pressure tables. Using the correct pressure is essential to the safe running of the tyre. Underinflation could result in the tyres running at abnormally high temperatures leading to thermal degradation of the tyres’ components. This degradation is irreversible and can result in a rapid deflation of the tyre.

The consequences of running underinflated are not necessarily immediately evident and may appear later after the underinflation has been corrected.

  • Tyre pressures must be checked on cold tyres at least once a week or when the vehicle is serviced, using a calibrated pressure gauge.
  • The spare tyre should also be checked.
  • Never “bleed” a tyre when hot.
  • The valve cap is the primary air seal and must always be fitted.

(Note: The valve core acts as a one way valve to allow the tyre to be inflated; it should not be treated as a seal).

If your pressure check indicates one of your tyres has lost pressure of 5 psi or more, look for signs of penetrations, valve leakage or wheel/rim damage which may account for the air loss. If the tyre is 20% below the maintenance air pressure, it must be considered flat. Remove and inspect for punctures or other damage. If run flat damage is detected, scrap the tyre.

Wheels

The state of all wheels should be regularly checked. Any cracked wheel or rim should be replaced.

  • Wheels or rims should not be repaired by welding. If a welding operation has to be undertaken, the tyre must be removed from the rim. If this is not done, there is a serious risk of explosion.
  • The tyre should only be refitted when all items have returned to ambient temperature.
  • Before any welding on the vehicle chassis or at proximity of the tyres, the tyre and wheel assemblies should be removed from the vehicle.
  • Before removing divided wheel assemblies from a vehicle, it is recommended that the tyres are deflated.

Care of tyres

Tyres on a vehicle must be checked regularly, taking particular care to check:

  • the tread, for signs of abnormal wear, cuts, deformations and embedded foreign objects (stones, bolts, nails etc...)
  • the sidewalls for cuts, impact damage (caused by pot-holes, riding curbs, etc...), rasping due to curbing, and abnormal deformations.

Causes of vehicle handling problems such as steering wheel vibrations, pulling to left or right, etc... should also be investigated.

If loss of pressure occurs, it is imperative to stop as quickly as possible, as running underinflated causes thermal degradation of the tyre components.

The tyre should be removed from the rim, and the reason for the loss of pressure determined.

Any damage must be examined by a tyre professional who is capable of determining if a repair is necessary or possible.

Repairs must be undertaken by a tyre specialist, who will accept responsibility for the repair.

Before any repair, the interior of the tyre must be examined to ensure theat no degradation has occurred.

Replacing tyres

Replacement tyres should be suitable for the conditions of use of the vehicle, and be capable of carrying the axle loads imposed.

Ensure that the tyre fitment conforms to local legislation.

Regrooving

Regrooving consists of opening up and deepening the existing tread pattern to increase the life of the tyre. Regrooving must be undertaken when between 2 to 3 mm of the original tread pattern remains, and in accordance with the tyre Michelin's recommendations.

International Legislation states that new tyres designed to be regrooved, must be marked “REGROOVABLE” or carry the symbol “U” on both sidewalls.

Twinning of tyres

When tyres are twinned, in order to avoid abnormal wear, and tyre overload problems, it is essential to ensure that twinned tyres

  • are of the same size, manufacturer and tread pattern
  • operate at the same pressure
  • do not have a difference in tread depths of greater than 4 mm.

Valve extensions fitted to inner twins, permit easy verification of tyre pressures.

It is essential to ensure that they are correctly fitted and supported with the appropriate brackets where necessary. (See diagrams below).

Retreading

Virtually all Michelin truck tyres are designed to be retreaded using Michelin’s unique process. Michelin Retreading forms the core of the ultimate retread service package offering top quality products, unrivalled technology, a superb service scheme and mileage comparable to that of a new tyre. Returning your casings for Michelin retreading is one of the most effective ways to cut tyre costs.

Storage of tyres and tubes

In order to avoid premature ageing and degradation of tyres, they should be stored in a dark and closed area.

If this is not possible, they should be protected from :

  • sources of ozone (sun, arc-welding, mercury vapour lamps...),
  • ultraviolet radiation,
  • exposure to the weather.

The tyres should be stored vertically on their treads, one against the other.

Tubes, flaps and rubber seals should be stored in their original packaging. They may be stored on shelves or in containers, on condition that the surfaces in contact with them are clean and smooth (to avoid risk of tearing, cuts or perforations).

Warning:

  • Re-assemly and inflation of mismatched parts can result in serious injury or death. Just because parts fit together does not mean that they belong together. Check for proper matching of all rim parts before assembly. Mismatching tyre and rim components is dangerous. A mismatched tyre and rim assembly may explode and can result in serious injury or death. This warning applies to any combination of mismatched components and rim combinations. Never assemble a tyre and rim unless you have positively identified and correcly matched the parts.
  • In order to aviod premature aging and degradation of tyres, they should be stored in a dark and closed area with the tyres standing vertically on their treads, one against the other. If this is not possible, they should be protected from exposure to the weather, sources of ozone (sun, arc-welding, mercury vapor lamps...) and ultraviolet (UV) radiation.
  • Never inflate or re-inflate any tyres that have been run underinflated or flat without careful inspection for damage, inside and out.
  • Always demount the tyre from the wheel and complete a thorough tyre and wheel inspection prior to returning the components to service