Volvo S40 Owner's Manual page 160

Summer and winter wheels
The arrow shows the tyre's direction of rotation
When summer and winter wheels are
changed they should be marked with which
side of the car they were mounted on, for
example L for left and R for right. Tyres with
tread patterns which are designed to only
rotate in one direction have the direction of
rotation marked with an arrow on the tyre.
The tyre should always rotate in the same
direction throughout its lifespan. Tyres
should only be switched between front and
rear positions, never between left and right-
hand sides, or vice versa. If the tyre is
mounted incorrectly, the car's braking
characteristics and capacity to force rain,
snow and slush out of the way are adversely
affected.
Tyres with the greatest tread depth should
always be fitted to the rear of the car (to
decrease the risk of skidding).
Contact an authorised Volvo workshop if you
are uncertain about tread depth.
07 Wheels and tyres
General
07
159