2017 Mercedes-Benz C300 — Sedan Base Model

The 2017 Mercedes-Benz C300 Sedan Base Model shipped with 3 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.

This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.

225/50R17

Section width225 mm
Aspect ratio (sidewall height)50% (112.5 mm)
Rim diameter17"
Overall tire diameter~25.9"
Revolutions per mile~780

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225/45R18 (Front)

Section width225 mm
Aspect ratio (sidewall height)45% (101.3 mm)
Rim diameter18"
Overall tire diameter~26"
Revolutions per mile~777

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245/40R18 (Rear)

Section width245 mm
Aspect ratio (sidewall height)40% (98 mm)
Rim diameter18"
Overall tire diameter~25.7"
Revolutions per mile~784

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What this size means for your Mercedes-Benz C300

On the 2017 Mercedes-Benz C300 Sedan Base Model, the factory 225/50R17 measures about 25.9″ in overall diameter with a 112.5 mm (4.4″) sidewall, and completes roughly 780 revolutions per mile. Its 50-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a passenger (P-metric / Euro-metric) size.

The 225/50R17 and 225/45R18 roll within 0.1″ (0.4%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.

Other 2017 Mercedes-Benz C300 trims

Mercedes-Benz C300 tire sizes by year

See every Mercedes-Benz C300 year & trim →

How to read a tire size

A tire size like 225/45R17 breaks down into three parts: the first number is the section width in millimeters (the tire's width from sidewall to sidewall), the second is the aspect ratio — the sidewall's height as a percentage of that width — and the number after the "R" is the rim diameter in inches. A letter prefix (P or LT) indicates Passenger or Light Truck construction; its absence usually means Euro-metric sizing.

Some trucks and off-road tires instead use "flotation" sizing, like 37X12.50R17 — here the numbers are the tire's overall diameter and width in inches directly, with the rim diameter last.

Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.