Pontiac G8 Wheel Lug Pattern, Offset, and Center Bore Reference

The Pontiac G8 wheel lug pattern is a key specification for selecting compatible aftermarket and replacement wheels. This model features a wheel lug pattern of 5×120 mm PCD, a popular size among GM vehicles, ensuring a broad range of wheel options.\n\nWheel offset (ET) and center bore dimensions are crucial for proper fitment and alignment. Typically, Pontiac G8 wheels meet offset values around ET38 to ET42 mm with a center bore of 70.3 mm. These metrics optimize handling and clearance for brakes and suspension components.\n\nRim size choices for the Pontiac G8 vary by year and trim, commonly ranging from 18-inch to 20-inch diameters. Using the correct lug pattern and offset combined with appropriate rim size ensures safety, performance, and aesthetics.\n\nOur year-sorted Pontiac G8 wheel lug pattern catalog provides detailed reference tables to help you verify fitment before purchasing wheels or tires, preventing common compatibility issues.

Year
Make / model / trim Year Tire Rim width (in) Rim diam. (in) Bolt pattern Offset ET Bore DIA Mounting
Pontiac G8 3.6L2019245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2019245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2018245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2018245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2017245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2017245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2016245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2016245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2015245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2015245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2014245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2014245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2013245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2013245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2012245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2012245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2011245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2011245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2010245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2010245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2009245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2009245/40R198195×1204569.5M12*1,5
Pontiac G8 3.6L2008245/45R188185×1204069.5M12*1,5
Pontiac G8 6.0L2008245/40R198195×1204569.5M12*1,5

FAQ

What is the Pontiac G8 wheel lug pattern specification?
The Pontiac G8 uses a 5×120 mm wheel lug pattern, which indicates 5 lug nuts spaced on a 120 mm pitch circle diameter.
Why is wheel offset (ET) important for Pontiac G8 wheel fitment?
Wheel offset affects how the wheel aligns with the suspension and body. Correct ET values (usually between ET38 and ET42 for the G8) ensure proper clearance and handling.
Can I use wheels from other vehicles on my Pontiac G8?
Wheels from other vehicles with matching 5×120 mm PCD, similar offset, and a 70.3 mm center bore are generally compatible, but always verify all specifications before installation.
Tire size calculatorShow

Compare two tire sizes — diameter, speedometer error, and clearance change.

inchmm
Size 1Size 2DiffDiff(%)
Diameter25.0"25.4"0.5"1.89%
Width7.7"8.5"0.8"10.26%
Circumference78.4"79.9"1.5"1.86%
Profile height5.0"4.2"-0.7"-15.08%
Turnover per mile80779314-1.73%
Clearance--+0.2"-
25.0"
7.7"
old tire side
25.5"
8.5"
new tire side
old tire
15"
old rim
5.0"
new tire
17"
new rim
4.2"

Speedometer Error

(First wheel OEM size)

Reading20 mph30 mph40 mph50 mph60 mph70 mph80 mph90 mph
Actual20.430.540.750.961.171.281.491.6