Operation Manual

230 Car care and technical information
Flat spotting
All tires get hot, especially on long journeys
or when the car is driven hard. After the car
has been parked with hot tires and the tires
have cooled down, a flat spot can appear in
the tire, where it is in contact with the
ground. The same can occur if the car has
not been moved for a long time.
Flat spots can give rise to vibration that can
be felt through the steering wheel, similar to
that experienced when the wheels need bal-
ancing. Flat spots of this type disappear
once the tires get hot again, usually after
10–15 miles (20–25 km) of driving at cruis-
ing speed.
WARNING
If the car has been driven for several
years exclusively with alloy wheels and
steel wheels are now fitted, the bolt hole
threads in the brake hubs should be
cleaned before the thinner steel wheels
are fitted. Grit, salt and rust can clog the
inner threads making it impossible to
achieve the correct tightening torque.
IB539
Tightening sequence, wheel bolts
IB1800
IB1800
Removing the wheel cover