Mercedes M-Class (W166) Tire Sizes & Rim Dimensions by Year and Trim

The Mercedes M-Class (W166), produced between 2012 and 2015, features a variety of tire sizes depending on the year and trim level. Base trims typically come with 18-inch rims, while higher trims often feature 19- or 20-inch options. Tire markings on these vehicles follow standard metric sizing, indicated as width/profile diameter (e.g., 255/55R18).\n\nRim width and diameter combinations vary across trims; common widths range from 7.5 to 9 inches. These differences affect tire choice and vehicle handling. When comparing trims, it is important to consult exact tire size codes to ensure compatibility and optimal performance.\n\nUnderstanding the correct tire size markings and rim specifications helps maintain driving safety and comfort. Always verify the specific model year and trim to select tires that meet Mercedes factory recommendations.\n\nFor practical comparisons, focus on the trim's factory-installed wheel sizes and consult the owner's manual or trusted catalog references for precise tire dimensions and load ratings.

For bolt pattern (PCD), offset ET, center bore, and mounting details, open the bolt pattern page for Mercedes M-Class (W166).