Mercedes-Benz SL-Class 2008 Owners Manual - Manual (Page 452)

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Technical data
Rims and tires
Mixed size tires
Model 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
or
255/40 R18 95Y MOExtended
2
2 Must be used in conjunction with Tire Pressure Monitoring System (U.S. vehicles), Run Flat Indicator (Canada vehicles), or Advanced Tire Pressure Monitoring
System* (Canada vehicles) only.
255/40 R18 95Y
or
255/40 R18 95Y MOExtended
2
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
1,3
3 Must not be used with snow chains.
285/35 R18 97W
or
285/35 R18 97Y MOExtended
2
285/35 R18 97Y
or
285/35 R18 97Y MOExtended
2