PP Bear
LIFE MEMBER
There's probably not a week goes by when someone doesn't ask the question of tyre pressures. It's at this stage that every other motorhome owner who has their tyres blown up to a desired pressure, passes on the info, which is wonderful as that's what we do on the forum.
However it does concern me that the ones that are asking, don't follow the manufacturers guidelines and advice.
I only fit Mitchelin Agilis Camping, as it's my choice to do so. I know there are other alternate brands, but the Mitchelins make me happy.
As to the pressures, I take the following advice from the people who know better; the manufacturer.
From the data sheet:
Motorhomes require tyres are that are adapted to their conditions of use. In 2003, the ETRTO (European Tyre and Rim Technical Organisation) changed the standard, as well as its recommendations relating to motorhome tyres, and now says "CP-type tyres have been designed to cater for the higher loads imposed by motor-caravans”, and that "it is strongly recommended that motor- caravans are only fitted with CP-tyres”.
At replacement, Michelin strongly recommends the fitting of CP tyres to vehicles originally homologated and fitted with CP tyres.
The load on the tyre must not exceed its maximum limit for any reason, i.e. the load rating must be respected. The ETRTO also states that where CP tyres are used on the rear axle (single fitment), they must be inflated to a pressure of 5.5 bar instead of the normal pressure of 4.75 bar for example.
MICHELIN CP marked tyres are therefore specially designed to be driven at an inflation pressure of 5.5 bar (550 kPa) This higher pressure improves road holding and increases resistance to the challenging driving and usage conditions encountered by motorhomes, especially with regard to loads (occasional static and/or dynamic overload associated with this type of vehicle; considerable rear overhang, load imbalance, high centre of gravity due to highly positioned loads) and long-term periods of disuse.
Fitting tyres that are not adapted to this type of use could lead to:
- poor handling (roll, pitch, yaw, difficulties in road holding)
- in difficult or severe conditions, premature deterioration of tyre components, such as the crown, which could lead to a rapid deflation.
In use: check and adjust if necessary tyre inflation pressures monthly and before any long journey. Under-inflation can be dangerous: for example, for the tyre size 225/70R15 Camping CP, an under-inflation of 0.5 bar/7.2psi (11%) is equivalent to an overload of around 100 kg per tyre.
Overloading (even temporarily) or poor vehicle load distribution can cause premature deterioration of vehicle components and/or tyres and thereby cause damage to persons or property”.
If the vehicle is parked for a long time, do not leave the tyres under inflated, and always make sure that the inflation pressures are correct before next using the vehicle. Protect tyres from UV radiation, e.g. from sunlight, and use axle stands to avoid tyre contact with cold winter surfaces (concrete, stone etc).
However it does concern me that the ones that are asking, don't follow the manufacturers guidelines and advice.
I only fit Mitchelin Agilis Camping, as it's my choice to do so. I know there are other alternate brands, but the Mitchelins make me happy.
As to the pressures, I take the following advice from the people who know better; the manufacturer.
From the data sheet:
Motorhomes require tyres are that are adapted to their conditions of use. In 2003, the ETRTO (European Tyre and Rim Technical Organisation) changed the standard, as well as its recommendations relating to motorhome tyres, and now says "CP-type tyres have been designed to cater for the higher loads imposed by motor-caravans”, and that "it is strongly recommended that motor- caravans are only fitted with CP-tyres”.
At replacement, Michelin strongly recommends the fitting of CP tyres to vehicles originally homologated and fitted with CP tyres.
The load on the tyre must not exceed its maximum limit for any reason, i.e. the load rating must be respected. The ETRTO also states that where CP tyres are used on the rear axle (single fitment), they must be inflated to a pressure of 5.5 bar instead of the normal pressure of 4.75 bar for example.
MICHELIN CP marked tyres are therefore specially designed to be driven at an inflation pressure of 5.5 bar (550 kPa) This higher pressure improves road holding and increases resistance to the challenging driving and usage conditions encountered by motorhomes, especially with regard to loads (occasional static and/or dynamic overload associated with this type of vehicle; considerable rear overhang, load imbalance, high centre of gravity due to highly positioned loads) and long-term periods of disuse.
Fitting tyres that are not adapted to this type of use could lead to:
- poor handling (roll, pitch, yaw, difficulties in road holding)
- in difficult or severe conditions, premature deterioration of tyre components, such as the crown, which could lead to a rapid deflation.
In use: check and adjust if necessary tyre inflation pressures monthly and before any long journey. Under-inflation can be dangerous: for example, for the tyre size 225/70R15 Camping CP, an under-inflation of 0.5 bar/7.2psi (11%) is equivalent to an overload of around 100 kg per tyre.
Overloading (even temporarily) or poor vehicle load distribution can cause premature deterioration of vehicle components and/or tyres and thereby cause damage to persons or property”.
If the vehicle is parked for a long time, do not leave the tyres under inflated, and always make sure that the inflation pressures are correct before next using the vehicle. Protect tyres from UV radiation, e.g. from sunlight, and use axle stands to avoid tyre contact with cold winter surfaces (concrete, stone etc).
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