Mercedes-Benz M-Class 2009 Owners Manual - Manual (Page 409)

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