Volvo 850 Manual page 92

Experience shows that the spare tyre is seldom used nowadays. It may
lie unused for 4 or 5 years before it is brought out and used as a road
tyre for another 4 or 5 years. It is not advisable to use such an old tyre
since rubber ages. For this reason, Volvo has developed a new type of
spare tyre which is only intended to be used for the short period during
which the standard tyre is being repaired or replaced.
This special spare tyre is known as the Temporary spare. It has the
following designation: T 115/70 R 15. It weighs less than half a conven-
tional tyre. Tyre inflation pressure should be 420 kPa (60 psi ) irres-
pective of the load in the car and the axle to which the tyre is attached.
This tyre meets all existing legal requirements and it is strong enough
to cope with the maximum permitted axle load. If this tyre is destroyed,
you can purchase a new replacement from your Volvo dealer.
"Temporary spare" tyre on steel rim
Note: The temporary spare may only be used as a temporary replac-
ement for a wheel with a flat tyre and must be replaced as soon as
possible with a standard tyre.
Only one wheel of this type may be fitted to a car at any time.
Remember also that this tyre used in combination with standard tyres
may have an effect on the handling of the car. The permitted maximum
speed using a temporary spare is therefore 50 mph (80 km/h),
although the tyre itself is suitable for higher speeds.