2008 Mercedes-Benz GL550 — Base Model
The 2008 Mercedes-Benz GL550 Base Model shipped with 2 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.
295/40R21
| Section width | 295 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (118 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~30.3" |
| Revolutions per mile | ~666 |
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265/40R22
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (106 mm) |
| Rim diameter | 22" |
| Overall tire diameter | ~30.3" |
| Revolutions per mile | ~665 |
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What this size means for your Mercedes-Benz GL550
On the 2008 Mercedes-Benz GL550 Base Model, the factory 295/40R21 measures about 30.3″ in overall diameter with a 118 mm (4.6″) sidewall, and completes roughly 666 revolutions per mile. Its 40-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a large-diameter fitment.
The 295/40R21 and 265/40R22 roll within 0″ (0%) 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.
On a vehicle of this age, the Mercedes-Benz GL550 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 GL550 tire sizes by year
- 2016 Mercedes-Benz GL550 295/40R21
- 2015 Mercedes-Benz GL550 295/40R21
- 2014 Mercedes-Benz GL550 295/40R21
- 2013 Mercedes-Benz GL550 295/40R21
- 2012 Mercedes-Benz GL550 295/40R21
- 2011 Mercedes-Benz GL550 295/40R21
- 2010 Mercedes-Benz GL550 295/40R21
- 2009 Mercedes-Benz GL550 295/40R21
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.