Mercedes-Benz 2009 M-Class Operator's Manual page 409

Model
Rim
Wheel offset
45
Minispare tire
45
Collapsible tire
Recommended tire inflation pressure
45 Must not be used with snow chains.
ML 350
ML 550
4.0 B x 18 H2
1.58 in (40 mm)
T 155/90 D18 113M
or
T 155/90 R18 113M
—
61 psi (4.2 bar)
Technical data
Rims and tires
ML 63 AMG
5.5 B x 19 H2
0.51 in (13 mm)
—
185/85-19 104P
51 psi (3.5 bar)
Z
407