Volvo S80 Owner's Manual page 122

Tread wear indicators are narrow, raised areas
across the tread that have approximately
1.6 mm less tread depth than the remainder of
the tyre (the letters TWI are on the side of the
tyre). When this bar is visible, only 1.6 mm of
tread remains and the tyre should be replaced
immediately. Bear in mind that road grip and
the tyre's ability to push water out of the way is
already affected markedly when there is 3-4 mm
of remaining tread.
When you change between summer and winter tyres; mark on the tyre
which side they were fitted: For example, L = left, R = right.
NOTE! Tyres should have the same direction of rotation throughout their
life. Tyres with tread designs that are made to roll only in one direction,
have the direction of rotation marked with an arrow on the tyre.
If the tyres are fitted incorrectly this will impair the car's braking characte-
ristics and the ability to disperse rain, snow and slush.
Tyres with the greatest tread depth should always - irrespective of rear
or front wheel drive - be fitted at the rear.
Contact your closest Volvo dealer to check if you are unsure.
Wheels should be stored horizontally or suspended, not vertically.
Spare wheel "Temporary Spare" (certain variants
and markets)
The "Temporary Spare" should only be used for the short time it takes to
repair or replace the normal tyre.
By law it is only legal to temporarily use the spare wheel/tyre in
connection with tyre damage. A wheel/tyre of this type should
therefore be replaced by a normal wheel/tyre.
Bear in mind that this tyre combined with the other normal tyres may
7700312m
cause different driving characteristics.
The maximum speed with a "Temporary Spare" is therefore
80 km/h (50 mph).
NOTE! Only use the car's original spare wheel! Tyres of other dimen-
sions may damage your car. Only one spare wheel may be used at a time.
121