Volvo S80 Owner's Manual page 120

We recommend the use of winter tyres, size 195/65 R15 except for cars
with turbo engines. For these cars we recommend tyre size 205/55 R16.
Always use winter tyres on all four wheels!
NOTE! Always consult your Volvo dealer as to which wheel and tyre
type is appropriate for your car.
Studded winter tyres
Studded winter tyres should be run in for 500-1000 kilometres
(300-600 miles), softly and gently so that the studs sit in the tyre correctly.
This extends the service life of both the tyres and the studs while making
the drive a bit quieter. Ensure that the studded tyres have the same
direction of rotation throughout their lifetime. If you wish to shift wheels,
see to it that they remain on the same side as previously.
Please remember: The regulations for using studded tyres vary from
country to country.
Snow chains
Snow chains may only be used on the front wheels. This also applies to
all-wheel drive cars.
Avoid driving on bare surfaces unnecessarily as this generates much wear
on both the snow chains and the tyres.
Only Volvo-approved snow chains are permitted. Use of other snow
chains could damage your car.
Never drive faster than 50 km/h when snow chains are fitted!
Never use "quick links" because the space between the disc brakes
and the wheels is too small.
Locking wheel bolts can be used on both aluminium and steel rims.
If steel rims with locking wheel bolts are used in combination with wheel
covers then the locking wheel bolts must be fitted furthest from the air
valve. Otherwise the wheel cover cannot be fitted on the rim.
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