Porsche Cayman Owner's Manual page 232

Fitting snow chains
Using snow chains is not permitted if 1/5 in.
(5 mm) spacers are fitted.
f
To permit the fitting of snow chains, have the
5 mm spacers removed on all 4 wheels.
f
Before fitting chains, remove accumulated ice
and snow from the wheel well.
f
Vehicles with snow chains must not be driven
faster than 30 mph (50 km/h).
Different states and countries have varying
statutory requirements regarding maximum
speed.
f
Check with local authorities for possible
restrictions.
f
Remove chains as soon as the roads are free
of ice and snow.
Spacers
NOTICE
Risk of damage to the wheel housings if the
spacers are not removed before fitting snow
chains.
f
To permit the fitting of snow chains, have the
5 mm spacers removed on all 4 wheels.
230
Minor Repairs
Example of Inscription
Inscription on radial tire
A – Tire size
Example: P 265/40ZR18 (101Y)
– P - The tire is designed for Passenger vehicle.
This information is not included on all tires.
– 265 - Indication of tire width in mm
– 40 - Indication of tire height to tire width ratio
in percent
– ZR - Belt type code letter for radial
– 18 - Indication of rim diameter in inches
– 101 - Load capacity coefficient
– Y - Speed code letter
– XL (Extra Load) - Tire with increased load
rating
B – TIN (Tire Identification Number)
Example: DOT xx xx xxxx xxxx
– DOT
The DOT symbol indicates that the tires
comply with the requirements of the
US Department of Transportation and provides
information about:
– first two-digit code means manufacture's
identification mark.
– second two-digit code means tire size.