Ferrari 488, Owner'S Manual

Page: 34 / 270

34
General
Explanation of codes and wording on tyre side walls
1
) Tyre size and characteristics
Example:
245/35 ZR 20 (105Y)
245
= Nominal width (distance in mm from side to side)
35
= Height/width ratio as a percentage
ZR
= Radial tyre that can withstand speeds above 240 km/h.
Combined with the specific load and speed code (in brackets), this
indicates a tyre that can withstand speeds above 300 km/h.
20
= Rim diameter in inches
105
= Load index: numerical code associated with the maximum
load permissible on the tyre at a given pressure, at the speed
corresponding to the relative index. The maximum load permissible
is indicated in kg and pounds in the wording (3).
Y
= Speed index
This indicates the maximum speed at which the tyre can withstand
the load indicated in the load index.
Speed indexes (ECE-UN 30) are shown in the table below:
Speed Index Maximum speed (km/h)
M 130
N 140
P 150
Q 160
R 170
S 180
T 190
U 200
H 210
V 240
W 270
Y 300
ZR (... Y) > 300
The speed index Y, shown in brackets and associated with the
abbreviation ZR, indicates a tyre that can withstand speeds above
300 km/h.
M
A
X
P
R
E
S
S
3
4
0
K
P
A
(
5
0
P
S
I)
M
A
X
L
O
A
D
9
2
5
K
G
(
2
0
3
9
L
B
S
)
C
A
N
A
D
A
A
N
D
U
.
S
.
C
O
D
E S
O
N
L
Y
+ 2 S T E E L + 1 P O LYA
M ID
E
T R E A D P L I E S : 1 PO LY
E S T
E R
S I D E WA L L P LY 4 P OLY
E S T
E R
1
2
3
4
5
6
7
8