2004 Mercedes-Benz G55 — Base Model
The 2004 Mercedes-Benz G55 Base Model came from the factory equipped with 285/55R18 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
285/55R18
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (156.8 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~30.3" |
| Revolutions per mile | ~665 |
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What this size means for your Mercedes-Benz G55
On the 2004 Mercedes-Benz G55 Base Model, the factory 285/55R18 measures about 30.3″ in overall diameter with a 156.8 mm (6.2″) sidewall, and completes roughly 665 revolutions per mile. Its 55-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.
On a vehicle of this age, the Mercedes-Benz G55 may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.
Mercedes-Benz G55 tire sizes by year
- 2011 Mercedes-Benz G55 275/55R19
- 2010 Mercedes-Benz G55 275/55R19
- 2009 Mercedes-Benz G55 275/55R19
- 2008 Mercedes-Benz G55 285/55R18
- 2007 Mercedes-Benz G55 285/55R18
- 2006 Mercedes-Benz G55 285/55R18
- 2005 Mercedes-Benz G55 285/55R18
- 2003 Mercedes-Benz G55 285/55R18
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.