DAILY MCA2014 4x4 ‒ BODYBUILDER INSTRUCTIONS
CHASSIS INTERVENTIONS
2.14 CHANGING TYRE SIZE
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– Printed 603.95.994 – 1 Ed. - Base 05/2015
2.14 CHANGING TYRE SIZE
Note
Replacing the tyres with others of measure or load bearing capacity that differs from the specifications recorded at vehicle approval
require IVECO certification, as well as a test to determine whether the braking system requires adjustment.
The vehicle must then be presented to the competent Body that will inspect the new tyres and the vehicle documents.
Mounting larger tyres:
● always requires a size check in relation to mechanical components, wheel arches, etc., in the various dynamic, steering and
vehicle shaking conditions;
● may entail rim replacement with the consequential need to verify the spare tyre holder modification;
● may affect distance from ground of the rear under-run protection device and, in this case, a check on standard compliance is
required; if necessary the support brackets must be replaced with appropriate and approved counterparts (see chapter 2.20
( ➠ Page 34));
● requires the need to check compliance of the limit transversal contour allowed in relation to the various standards.
Prescriptions
Note
Replacing tyres with others of different external diameter affects vehicle performance (e.g.: speed, max. vehicle ramp slope, tow
load, braking force, etc.); therefore the body-computer (speedometer, tachograph and speed limiter) must be subject to recalibra-
tion at an authorised IVECO workshop.
▶ Tyres of different size and type of structure cannot be mounted on the same axle.
The tyre load bearing capacity and the relative reference speed must be suitable to the vehicle's performance.
Mounting tyres with lower load bearing capacity or reference speed entails a reduction of allowed loads; on the other hand,
mounting tyres with greater load bearing capacity does not automatically entail an increase of load allowed on the axles.
The dimensions and load bearing capacity of the tyres are established by international and national standards (ETRTO, DIN, CUNA,
etc.) and are listed in the manuals of their respective Manufacturers.
Particular performance values may be envisaged by national standards for special uses, fire-protection, winter services, airport tank
trucks, buses, etc.
▶ If vehicle configuration requires the wheels to be removed, make sure that the contact surfaces
between rim and connection flange are clean and free of corrosion when remounting the wheels.
In addition, tighten the wheel studs at the tightening torque according to the IVECO standard
(see the following Table).
Table 2.11 - Wheel tightening torques according to IVECO STD 17-9219
CONNECTING ELEMENTS
Thread
TIGHTENING
Name CLASS
Torque [Nm]
FEATURES “S”
(*)
Min Max
Front and rear wheel mounting
(33S-55S)
Stud M18x1.5 II 305 375 “S”
(*)
Characteristic “S”: safety tightening (see IVECO std. 19-0405).
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