Porsche cayman gt4 Owner's Manual page 197

Speed code letters
The speed code letter Y indicates the maximum
permitted speed for the tire.
This code letter is shown on the tire sidewall.
T up to 118 mph (190 km/h)
H up to 131 mph (210 km/h)
V up to 150 mph (240 km/h)
W up to 165 mph (270 km/h)
Y up to 185 mph (300 km/h)
(Y) up to 185 mph (300 km/h) as for Y tires.
Speeds of more than 185 mph
(300 km/h) are also possible at a
maximum tire load capacity of 85 %
(confirmation from tire manufacturer
required for speeds of more than
185 mph (300 km/h)).
Information
Tires with a maximum speed rating that is lower
than the specified maximum vehicle speed may be
mounted only if they bear an M+S identification on
the tire sidewall.
f
Please note that in addition to snow tires,
all-season tires are also subject to speed limits
and bear this identification.
f
Never drive faster than the speed rating of the
tires, and obey all speed and traffic laws.
G - Rim width in inches
H - Rim-flange contour code letter
I - Symbol for drop-center rim
J - Rim diameter in inches
K - Double hump
L - Rim offset in mm
Inscription on alloy wheels
The information is provided on the rear of the
spokes. The rim width in inches A and the rim
offset F are visible from the outside. This
information can be found near the tire valve.
Jacking point for lifting platform and jack at the front
Raising the vehicle with a lifting platform,
trolley jack or standard jack
f
Before driving the vehicle onto a lifting
platform, make sure that there is sufficient
space between the lifting platform and the
vehicle.
Minor Repairs
195