Volvo C30 Owner's Manual page 188

07 Wheels and tyres
General
recommended not to drive on winter tyres that
have a tread depth of less than 4 mm.
Snow chains
Snow chains may only be used on the front
wheels. This also applies to all-wheel-drive
cars.
Never drive faster than 50 km/h with snow
chains. Avoid driving on bare ground as this
wears out both the snow chains and tyres.
WARNING
Use Volvo genuine snow chains or equiva-
lent chains designed for the car model, and
tyre and rim dimensions. In the event of
uncertainty Volvo recommends that you
consult an authorised Volvo workshop. The
wrong snow chains may cause serious
damage to your car and lead to an accident.
Rims and wheel nuts
Only use wheel rims that are tested and
approved by Volvo and which are included in
07
the Volvo genuine accessories range.
188
Standard wheel nuts.
Bulge acorn wheel nut with fixed washer.
There are two types of wheel nut, depending
on whether the wheel rims are made of steel or
aluminium.
1. Tighten the wheel nuts of model (1) to
110 Nm. Tighten the wheel nuts of model
(2) to 130 Nm.
2. Check the torque with a torque wrench.
IMPORTANT
The wheel nuts (1) should be tightened to
110 Nm and (2) to 130 Nm respectively.
Overtightening can damage the nuts and
the bolts.
Steel rims – standard wheel nuts (1)
Steel rims are normally mounted with the
standard wheel nuts, but the bulge acorn vari-
ety may also be used.
WARNING
Never use standard nuts for aluminium rims.
The wheel could come loose.
Aluminium rims – bulge acorn wheel nuts
(2)
Only use the bulge acorn variety of nuts with
aluminium rims. These differ markedly from
other nut types as they have a rotating conical
washer.
NOTE
These nuts may also be used with steel rims.
Locking wheel nuts
Locking wheel nuts can be used on both alu-
minium and steel rims. If steel rims with locking