Mercedes-Benz R-Class 2006 Owners Manual - Manual (Page 517)

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Technical data
Rims and tires
Same size tires
R 350 R 500 R 350 (Sport Package*)
R 500 (Sport Package*)
Rims (light alloy) 7.5 J x 17 H2 8 J x 18 H2 8 J x 19 H2
Wheel offset 2.20 in (56 mm) 2.64 in (67 mm) 2.64 in (67 mm)
Summer tires 1 - - 255/50 R19 103W
All-season tires 1 235/65 R17 104H M+S 255/55 R18 105H M+S -
Winter tires 1,2 235/65 R17 104H M+S . 255/55 R18 105H M+S. -
1 Radial-ply tires
2 Not available as factory equipment.