SMART forfour Operating Instructions Manual page 234

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Tyre damage
Tyre damage may be caused e.g. by:
the vehicle's operating conditions,
curbs,
foreign bodies,
inadequate tyre pressure,
weather and environmental factors,
contact with oils, greases, fuels, etc.
Accident risk!
Driving over curbs or sharp
edged objects can cause damage to the
tyre's carcass that is not externally
visible. Damage to the tyre's carcass
will only become evident much later
and may result in tyre damage. You
could lose control over your vehicle as
a result and cause an accident which
could injure yourself or others.
Accident risk!
Never clean tyres with high
pressure equipment. This could lead to
tyre damage and failure. You could con
sequently cause an accident or injure
other persons.
Tyres and wheels
Interchanging wheels
Accident risk!
Only interchange the front and
rear wheels if they are of the same di
mensions, e.g. rim size, wheel offset.
On cars with the same size of wheels all
round, depending on the level of wear you
can interchange the wheels every 5,000 to
10,000 kilometres (approx. 3,000 to 6,000
miles). Always keep a wheel's direction
of rotation the same.
The front and rear wheels will wear at
different rates, depending on the oper
ating conditions. Interchange the wheels
before a characteristic wear pattern has
become established on the tyres.
Clean the contact surface of the wheels
and brake disc/inner side of the wheel
each time the wheels are changed. Check
the tyre pressure.
Helpful hints 9 31