When did GM go to 8x180?
The straightforward answer is that General Motors has not adopted an official 8x180 lug pattern for its mainstream production vehicles. GM’s modern heavy-duty trucks and many vans continue to use an 8-lug configuration with a 165.1 mm (6.5 inch) bolt circle. If you’re seeing 8x180 listed somewhere, it’s likely aftermarket labeling or a non-GM model, not a GM standard.
Understanding lug patterns can be tricky because aftermarket wheel catalogs frequently label patterns in different ways or cite non-standard measurements for marketing purposes. The question, at its core, asks whether GM ever shifted its standard 8-lug bolt circle to 180 mm. In practice, there is no documented, company-wide move to 8x180 in GM’s US-market lineup, though regional variations or specialized vehicles could differ. This article lays out what is known and how to verify your specific vehicle.
GM lug patterns through the years
General Motors has relied on a few core lug patterns over the decades, with 8-lug configurations centered around a 165.1 mm bolt circle appearing most prominently in its heavy-duty trucks and certain vans, especially in the late 1990s through today. There have not been public announcements or widespread documentation from GM indicating a transition to 8x180 mm for its standard production vehicles as of 2025. When 8x180 shows up in catalogs, it is typically related to aftermarket wheels, mislabeling, or non-GM platforms rather than a GM factory specification.
What to do if you encounter 8x180 wheels for a GM vehicle
Before you assume compatibility, take these verification steps to avoid fitting issues or safety concerns:
- Check the vehicle’s official specifications in the dealer’s parts catalog or the owner’s manual for the correct lug pattern.
- Compare the wheel’s stated pattern to the vehicle’s documented pattern (for example, 8x165.1 mm for many GM heavy-duty trucks).
- Ask the wheel manufacturer or retailer for model-year-specific fitment data to confirm whether an 8x180 option is truly supported on your GM model.
- Avoid using adapters to force a mismatch unless you’re consulting a qualified technician and following all safety/warranty guidelines.
In practice, if your GM vehicle requires 8x165.1 mm, wheels labeled 8x180 will not be a drop-in fit without specialized hardware and engineering consideration. Always verify with authoritative sources.
How to verify on your own GM vehicle
If you want to confirm quickly on your own, use these checks:
- Inspect the door jamb placard or the glovebox/owner’s manual for the lug pattern specification.
- Consult GM’s official service or parts catalogs for your exact model and year.
- Measure the bolt circle on your current wheels or hub by counting lug holes and measuring center-to-center distance across opposite holes (a caliper helps ensure accuracy).
- Contact your GM dealership’s parts department if you’re unsure about the pattern.
Bottom line: for GM’s mainstream lineup, 8x165.1 mm remains the standard widely documented by GM and aftermarket references; 8x180 is not an official GM standard as of 2025.
Summary
GM has not publicly adopted an 8x180 lug pattern for its mainstream production vehicles. The established pattern for GM’s heavy-duty trucks and many vans has been 8x165.1 mm (6.5 inches) for decades, with no official shift to 8x180 announced through 2025. If you encounter an 8x180 listing, treat it as aftermarket or non-GM, and verify through GM’s official resources or a trained dealer before purchasing wheels or adapters.
For readers seeking the latest model-year specifics, consult GM’s official parts catalogs, your dealership’s service department, or reputable wheel manufacturers’ fitment guides to confirm the correct lug pattern for your exact vehicle configuration.
Will 8x6.5 fit on 8x180?
1mm; Wheel Bolt Pattern/ PCD - 8x180mm Wheel Adapters are used to change bolt patterns in order to properly fit wheels from one vehicle to the hub of a different vehicle. Note: Only work with 8x180 wheels, the original 8x6. 5 wheels will not fit The bolt pattern of a wheel is the layout of the mounting holes.
When did GM go from 8x6.5 to 8x180?
2011 & Newer GMC / Chevrolet 2500 - 3500 8x180 Wheel Bolt Pattern. 2011 was a year of change for both the GMC Sierra 2500 and 3500 and also the Chevrolet Silverado 2500 and 3500. Switching from the long standing 8x6.
What year did GM change the 8 lug pattern?
Ford , GM, dodge all had 8x6. 5 bolt pattern from pre 1980 all the way until 1999 and that's when ford changed to 8x170. Gm and dodge kept the 8x6. 5 until 2012 when GM changed to 8x180 Dodge still runs the 8x6.
When did Chevy change the bolt pattern on a 2500?
Common Silverado Lug Patterns by Model Year
Silverado 1500 (1999–2025): 6×139.7 mm. Silverado 2500HD & 3500HD (pre-2011): 8×165.1 mm. Silverado 2500HD & 3500HD (2011–2025): 8×180 mm.
