2006 Pontiac G6 — GT Sedan
The 2006 Pontiac G6 GT Sedan 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.
225/50R17
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (112.5 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~25.9" |
| Revolutions per mile | ~780 |
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225/50R18
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (112.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~26.9" |
| Revolutions per mile | ~751 |
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What this size means for your Pontiac G6
On the 2006 Pontiac G6 GT Sedan, 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 225/50R18 differ by about 1″ (3.9%) in overall diameter; a gap this size is enough to affect speedometer and odometer readings, so confirm which one your vehicle actually left the factory with.
On a vehicle of this age, the Pontiac G6 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.
Other 2006 Pontiac G6 trims
- GT Convertible 225/50R18
- GT Coupe 225/50R17 / 225/50R18
- GTP Convertible 225/50R18
- GTP Coupe 225/50R18
- GTP Sedan 225/50R18
- Sedan 215/60R16
Pontiac G6 tire sizes by year
- 2010 Pontiac G6 225/50R17 / 225/50R18
- 2009 Pontiac G6 215/55R17 / 225/50R17
- 2008 Pontiac G6 225/50R18
- 2007 Pontiac G6 225/50R18
- 2005 Pontiac G6 225/50R17
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.