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CHASSIS MODIFICATIONS
D
AILY 4x4
Base - May 2007 Print 603.93.761
Changing the Size of the Tyres
Changi n g th e Siz e of th e Tyr es
2.14 Changing the Size of the Tyres
Replacing t he tyres with others of different sizes or with a different loading capacity with respect to those considered at th e time
of vehicle type-approval must be approved by IVECO and it is also necessary to check for the need to reprogram the EBL or EBS
system.
Changing the size of the tyres may involve replacing the wheels with others of a correspondingly greater loading capacity. In this
case check whether the spare wheel carrier needs to be changed.
Mounting tyres of different sizes or types of construction on the same axle is prohibited.
Changing the size of the tyres may affect the ground clearance of the rear underrun guard, therefore the compliance with the national
legal requirements must be verified. Its supporting brackets, where necessary, may be replaced with other appropriate, type-ap-
proved brackets. See point 2.19.
The use of larger tyres always necessitates verification of the safety margins for the mechanical parts, wheel arches etc., under all
dynamic conditions of steering and bump travel. In certain cases th e use of wider tyres may entail a check on the axles to assess
the space required for the suspension components and the length of wheel studs etc.
Where there is local national legislation specifying overall w idths (e.c. Jersey etc.) t h ese must be c o mplied with.
The use of tyres with a different outside diameter affects the performance of the vehicle in terms of speed, maximum gradability,
pulling force, braking power etc. Th e tach ograph must be recalibrated by an authorised workshop. The load capacity and the relative
reference speed must always be compatible with the performance of the vehic le.
When the tyres with a load capacity or speed limit are chosen for a given vehicle, the permissible loads of the vehicle or its perform-
ance, must be reduced accordingly. On the other hand, the use of tyres with a greater load capacity does not automatically increase
the maximum permissible mass on the axles.
The size and load capacity of the t yres are established on the basis of international and national norms (ETRTO, DIN, CUNA etc.)
and are listed in the manuals of the respective tyre manufacturers.
Specific performance characteristics may be established by government regulations for special use in the case of fire-figh t ing vehicles,
vehicles for winter duty, airport tankers, buses etc.. Whenever so required by government regulations the vehicle must be presented
to the respective government agen cy for inspection of the parts that have been replaced and entry of the respective modifications
in the vehicle documents.
Altering the tyre size may require replacement of the box mounting brackets.NOTE
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