Mercedes-Benz CLK-Class 2006 Owners Manual - Manual (Page 475)

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Technical data
Rims and tires
CLK 55 AMG CLK 55 AMG
Rims (light alloy) 7.5 J x 17 H2 7.5 J x 18 H2
Wheel offset 1.45 in (37 mm) 1.45 in (37 mm)
Winter tires 1,2,3 225/45 R17 91 H M+S . 225/40 R18 92 H XL (Extra Load) M+S .
1 Radial-ply tires
2 Not available as factory equipment.
3 For use with snow chains contact an authorized Mercedes-Benz Center.