BMW X4 Owner's Manual page 323

Tire size Pressure specifications
in bar/PSI
Specifications in
bar/PSI with
cold tires
245/50 R 19 2.9 / 42
105 V XL M+S
245/50 R 19 3.1 / 45
105 W XL
Front: 245/45 R 2.5 / 36
20 103 Y XL
Rear: 275/40 R -
20 106 Y XL
Front: 245/45 R 3.0 / 44
20 103 W XL
Rear: 275/40 R -
20 106 W XL
Front: 245/40 R 2.8 / 41
21 100 Y XL
Rear: 275/35 R -
21 103 Y XL
Front: 245/45 R 2.8 / 41
20 103 V XL M
+S
Rear: 275/40 R -
20 106 V XL M
+S
Emergency Speed up to a max. of
wheel: 50 mph / 80 km/h
T 135/80 R 18 4.2 / 60
104 M
Tire marking
Tire size
245/45 R 18 96 Y
3.1 / 45
3.3 / 48
-
2.7 / 39
-
3.2 / 46
-
3.0 / 44
-
3.0 / 44
Online Edition for Part no. 01405A37CC6 - VI/21
Wheels and tires
245: nominal width in mm
45: aspect ratio in %
R: radial tire code
18: rim diameter in inches
96: load bearing capacity
Y: speed code letter
ZR tires: reinforced radial tire for speeds exceed‐
ing 150 mph/240 km/h
Maximum tire load
Maximum tire load is the maximum permissible
weight for which the tire is approved.
Locate the maximum tire load on the tire sidewall
and the Gross Axle Weight Rating – GAWR – on
the certification label on the driver door B-pillar.
Divide the tire load by 1.1. It must be greater
than one-half of the vehicle's Gross Axle Weight
Rating – GAWR. Note, front vs. rear GAWR and
tire loads, respectively.
Speed letter
Designation Maximum speed
Q up to 100 mph/160 km/h
R up to 106 mph/170 km/h
S up to 112 mph/180 km/h
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 167 mph/270 km/h
Y up to 186 mph/300 km/h
(Y) above 186 mph/300 km/h
Tire Identification Number
DOT Code: DOT xxxx xxx 1921
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
MOBILITY
323