Mercedes-Benz GL-Class 2009 Owners Manual - Manual (Page 429)

Rims and tires
427
Model GL 450
GL 550
GL 550
AMG rims (light alloy) 10 J x 21 H2 —
Rims (light alloy) — 8.5 J x 19 H2
Wheel offset 1.46 in (37 mm) 2.20 in (56 mm)
All season tires 28,29 295/40 R21 111V XL (Extra Load) M+S —
Winter tires 28,30 — 265/55 R19 109H M+S.
All-terrain tires 28,30 — 275/55 R19 111H M+S
28 Radial-ply tires
29 Must not be used with snow chains.
30 Not available as factory equipment.
Technical data
Z