Porsche Cayman Owner's Manual page 248

Example of Inscription
Inscription on radial tire
A Tire size
Example: P 265/40 ZR 18 101 Y
– 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
246
Practical Tips, Emergency Service
ZR-code letter for radial tires for speeds
–
above 150 mph / 240 km/h. There are cur-
rently no standards concerning tire strength at
speeds above 150 mph (240 km/h).
R- 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 Identication 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.
– third four-digit code means tire type code.