BMW Z4 ROADSTER Owner's Manual page 271

values in the tire inflation pressure table and
adjust as necessary.
Tire pressure values over
100 mph/160 km/h
Z4 sDrive30i
Tire size Pressure specifications in
bar/PSI
Specifications
in bar/PSI with
cold tires
225/50 R 17 98 2.2 / 32
H XL M+S
255/40 R 18 2.2 / 32
99 V XL M+S
Front: 255/40 2.2 / 32
ZR 18 95 Y
Rear: 275/40 -
ZR 18 99 Y
Front: 225/45 2.2 / 32
ZR 18 95 Y XL
Rear: 255/40 -
ZR 18 99 Y XL
Front: 255/35 2.2 / 32
ZR 19 96 Y XL
Rear: 275/35 -
ZR 19 100 Y XL
Emergency Speed up to a max. of
wheel: 50 mph / 80 km/h
T 135/90 R 17 4.2 / 60
104 M
2.2 / 32
2.4 / 35
-
2.2 / 32
-
2.2 / 32
-
2.2 / 32
Online Edition for Part no. 01405A88B63 - VI/23
Wheels and tires
Z4 M40i
Tire size Pressure specifications in
bar/PSI
Specifications
in bar/PSI with
cold tires
225/50 R 17 2.2 / 32
98 H XL M+S
255/40 R 18 2.6 / 38
99 V XL M+S
Front: 255/40 2.6 / 38
ZR 18 95 Y
Rear: 275/40 -
ZR 18 99 Y
Front: 255/35 2.6 / 38
ZR 19 96 Y XL
Rear: 275/35 -
ZR 19 100 Y
XL
Emergency Speed up to a max. of
wheel: 50 mph / 80 km/h
T 135/90 R 17 4.2 / 60
104 M
Tire marking
Tire size
245/45 R 18 96 Y
245: nominal width in mm
45: cross-sectional relationship in %
R: radial tire code
18: rim diameter in inches
96: load bearing capacity
Y: speed code letter
MOBILITY
2.2 / 32
2.6 / 38
-
2.6 / 38
-
2.6 / 38
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