What is the bolt pattern on a Chevy 3500 HD?
The bolt pattern on a Chevy 3500 HD is 8 on 6.5 inches (8x6.5). This means eight lug holes arranged on a circle with a 6.5-inch diameter.
Across modern Silverado 3500 HD models, including both SRW (single rear wheel) and DRW (dual rear wheel) configurations, wheels and adapters must match this 8x6.5 pattern. This article explains what that means, how to verify it on your truck, and how it affects wheel choices and aftermarket options.
Understanding the 8x6.5 bolt pattern
The 8x6.5 designation describes two things: the number of lug holes (eight) and the diameter of the bolt circle (6.5 inches). This pattern is standard on modern GM heavy-duty pickups in the Silverado 3500 HD family, meaning wheels built for 8x165 mm will generally fit both SRW and DRW variants when the pattern is specified as 8x6.5. The diameter is measured from the centers of opposite lug holes, and the eight holes are evenly spaced around the circle.
SRW vs DRW: same pattern, different rear configurations
Both single rear wheel and dual rear wheel versions of the 3500 HD use the same 8x6.5 lug pattern. The DRW setup adds a second wheel on the rear axle, but each wheel still uses eight lugs on a 6.5-inch bolt circle. When shopping for wheels, confirm the product notes specify 8x6.5 for GM heavy-duty trucks.
How to verify the bolt pattern on your truck
To confirm the bolt pattern on a specific Chevy 3500 HD, you can rely on a few practical checks. First, count the lug holes on the wheel hub. Second, measure the distance between the centers of opposite lug holes to approximate the bolt circle diameter. Third, consult official documentation or a parts catalog for your exact model year and drivetrain.
Before listing, here's a quick checklist to verify pattern and wheel compatibility:
- Count lug holes: eight lug holes indicate the 8x6.5 pattern.
- Measure bolt circle diameter (BCD): measure the distance between opposite lug holes; you should obtain about 6.5 inches (165.1 mm).
- Check wheel specs: aftermarket wheels often state "8x165" or "8x6.5"; confirm the center bore and offset also match your truck.
- Consult documentation: GM service literature or the owner's manual lists the wheel bolt pattern for Silverado/Sierra 3500 HD by year and drivetrain.
In summary, eight lugs on a 6.5-inch circle is the standard for Chevy 3500 HD trucks, and verification can be done through simple measurements, wheel specs, or official documentation.
Wheel compatibility and aftermarket considerations
When selecting wheels or adapters, ensure the product clearly states 8x6.5 for GM heavy-duty trucks. Pay attention to the center bore size and wheel offset, as these factors influence fitment with front brakes and fenders on DRW models. If you’re unsure, consult a dealer or a qualified installer to confirm compatibility and avoid fitment issues.
Summary
The Chevy 3500 HD uses an 8x6.5 bolt pattern, with eight lug holes arranged on a 6.5-inch circle. This pattern applies to both SRW and DRW configurations. Verify your specific truck’s pattern by counting lugs and measuring the bolt circle, or by checking GM documentation and wheel specifications. This ensures proper wheel fitment and safety when upgrading or replacing wheels.
What trucks use the 8x6.5 bolt pattern?
Popular vehicles that use the 8x165. 1 / 8x6. 5 bolt pattern include: Chevrolet Express 2500, Chevrolet Express 3500, Chevrolet Suburban 2500, Dodge Ram 2500, Dodge Ram 3500, Ford E-150, Ford E-350 Super Duty, GMC Savana 2500, GMC Savana 3500, GMC Yukon XL 2500, Nissan NV1500, Nissan NV2500, and Nissan NV3500.
When did GM go from 8x6.5 to 8x180?
GM switched from the 8x6.5" bolt pattern to the 8x180mm pattern for their GMC Sierra and Chevrolet Silverado 2500 and 3500 heavy-duty trucks in 2011. This change was implemented starting with the 2011 model year and continues to be the standard for these vehicles.
- Model year: 2011
- Affected models: GMC Sierra 2500 and 3500, and Chevrolet Silverado 2500 and 3500
- From: 8x6.5" bolt pattern
- To: 8x180mm bolt pattern
What is the bolt pattern on a Chevy 3500HD?
Silverado 2500HD & 3500HD (pre-2011): 8×165.1 mm. Silverado 2500HD & 3500HD (2011–2025): 8×180 mm.
What GM vehicles have a 6x120 bolt pattern?
6x120 Bolt Pattern
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