Mercedes-Benz SL-Class 2009 Owners Manual - Manual (Page 346)

Rims and tires
344
Same size tires
Model SL 550
SL 550 (Sport Package)
SL 600
SL 600 (Sport Package)
SL 63 AMG SL 63 AMG
SL 63 AMG (Performance Package)
SL 65 AMG
Rims (light alloy) 8.5 J x 18 H2 8.5 J x 18 H2 8.5 J x 19 H2
Wheel offset 1.38 in (35 mm) 1.18 in (30 mm) 1.18 in (30 mm)
Winter tires 18,19 255/40 R18 95V M+S.
or
255/40 R18 95V M+S.
MOExtended
20
255/40 R18 95V XL (Extra
Load) M+S. 255/35 R19 96V XL (Extra Load)
M+S.
18 Radial-ply tires
19 Not available as factory equipment.
20 Must be used in conjunction with Tire Pressure Monitoring System (U.S. vehicles) or Advanced Tire Pressure Monitoring System (Canada vehicles) only.
Technical data