User Manual - Page 210

For 2018 BMW X4.

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Tire size Pressure specifications
in bar/PSI
Front: 245/35 R 21
96 Y XL RSC
2.8 / 41 -
Rear: 275/30 R 21
98 Y XL RSC
- 3.2 / 46
Emergency wheel:
T 135/80 R 18 104
M
Speed up to a max. of
50 mph / 80 km/h
4.2 / 60
X4 M40i
Tire size Pressure specifications
in bar/PSI
Specifications in
bar/PSI with cold
tires
245/50 R 18 100
H M+S RSC
245/50 R 18 100 V
M+S A/S RSC
2.6 / 38 3.0 / 44
245/45 R 19 102 V
M+S XL A/S RSC
245/45 R 19 102 V
M+S XL RSC
2.8 / 41 3.2 / 46
Front: 245/45 R 19
98 W RSC
2.6 / 38 -
Rear: 275/40 R 19
101 W RSC
- 2.8 / 41
Front: 245/40 R 20
99 Y XL RSC
2.6 / 38 -
Rear: 275/35 R 20
102 Y XL RSC
- 2.8 / 41
Front: 245/40 ZR
20 99 Y XL Std
2.6 / 38 -
Tire size Pressure specifications
in bar/PSI
Rear: 275/35 ZR
20 102 Y XL Std
- 2.8 / 41
Front: 245/35 R 21
96 Y XL RSC
2.8 / 41 -
Rear: 275/30 R 21
98 Y XL RSC
- 3.2 / 46
Emergency wheel:
T 135/80 R 18 104
M
Speed up to a max. of
50 mph / 80 km/h
4.2 / 60
Tire identification marks
Tire size
245/45 R 18 96 Y
245: nominal width in mm
45: aspect ratio in %
R: radial tire code
18: rim diameter in inches
96: load rating, not for ZR tires
Y: speed rating, before the R on ZR tires
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 side‐
wall and the Gross Axle Weight Rating – GAWR
– on the certification label on the driver’s door
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
Q = up to 100 mph, 160 km/h
R = up to 106 mph, 170 km/h
Seite 210
Mobility Wheels and tires
210
Online Edition for Part no. 01402977904 - II/17
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