Mercedes-Benz 2009 M-Class Operator's Manual page 406

Technical data
Rims and tires
Model ML 550 (Sport Package)
AMG rims (light alloy) 8.5 J x 19 H2
Wheel offset (front 2.28 in (58 mm)
axle)
Wheel offset (rear 2.28 in (58 mm)
axle)
39 255/50 R19 107H XL (Extra Load) M+S
All season tires
39,40 —
Summer tires
39,41 255/50 R19 107H XL (Extra Load) M+S.
Winter tires
39 Radial-ply tires
40 Must not be used with snow chains
41 Not available as factory equipment.
404
ML 320 BlueTEC (Sport Package)
ML 350 (Sport Package)
ML 550 (Sport Package)
9 J x 21 H2
2.36 in (60 mm)
1.89 in (48 mm)
—
265/40 ZR21 105Y XL (Extra Load)
—