Mercedes-Benz SL-Class 2007 Owners Manual - Manual (Page 438)

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Technical data
Rims and tires
Mixed size tires
SL 550 SL 600
Front axle:
Rims (light alloy) 8.5 J x 18 H2 8.5 J x 18 H2
Wheel offset 1.38 in (35 mm) 1.38 in (35 mm)
Summer tires 1
1 Radial-ply tires
255/40 R18 95W 255/40 R18 95Y
Rear axle:
Rims (light alloy) 9.5 J x 18 H2 9.5 J x 18 H2
Wheel offset 1.57 in (40 mm) 1.57 in (40 mm)
Summer tires 1,2
2 Must not be used with snow chains.
285/35 R18 97W 285/35 R18 97Y