Motorhome tyres
If you’ve bought your motorhome from new, the appropriate tyres should have been fitted. If buying used, the replacement tyres could differ from the originals.
Motorhome manufacturers choose tyres best suited to carry the fully laden weight of the vehicle with appropriate reserves of safety. In most cases, these will be light commercial (C-type) or camping tyres (CP-type). The CP stands for “camping pneus” and confirms the tyre is a commercial tyre for use with motorhomes.
It’s always advisable to have the same tyres on all wheels, including the spare, to ensure uniform braking and other handling characteristics. Tyres of the same size and description must be fitted across an axle and, ideally, be of the same brand, tread pattern and condition. Hence the recommendation to replace tyres in axle pairs.
If you consider fitting new tyres with a different size or other service condition, you need to comply with regulations regarding load and speed capability, wheel arch clearance and compatibility with wheels. In general, never replace tyres with those of a lower speed or load capacity rating.
The load capacity of a tyre is indicated by the load index figure on the sidewall.
So, for the 225/75R16C tyre shown, the notation of 121/120R indicates the load index and maximum speed rating (R). Where two load indices are given, the lower figure is only used if you have twin wheels on a rear axle. The ‘121’ represents a maximum load of an individual tyre to be 1,450kg or 2,900kg for the axle.
Note that most tyre pressure charts relate to axle loads rather than individual wheels. For more information on load index and speed values, see the website of the tyre safety organisation, Tyresafe
Tyresafe recommends the maximum load on an axle should not exceed 90% of
