What is the bolt pattern on a Chevy GMC?
Chevy and GMC trucks and SUVs primarily use two wheel bolt patterns, depending on the model and drivetrain. The most common patterns are 6x139.7 mm (6x5.5 inches) for light-duty 1500-series models, and 8x165.1 mm (8x6.5 inches) for heavy-duty 2500/3500 models. Always verify the exact specification for your year and trim to ensure a correct fit.
Two primary bolt patterns used by GM trucks and SUVs
GM splits bolt patterns mainly by vehicle class. Here are the two patterns you’re most likely to encounter on Chevy and GMC trucks and large SUVs:
- 6x139.7 mm (6x5.5 inches) — This is the standard lug pattern on most light‑duty Silverado/Sierra 1500 pickups and many GM full‑size SUVs such as the Tahoe and Suburban, as well as similar trim levels in recent years.
- 8x165.1 mm (8x6.5 inches) — This pattern is used on GM heavy‑duty models, including Silverado/Sierra 2500 and 3500 variants, along with their corresponding SUVs in the HD family.
These two patterns cover the vast majority of current GM consumer trucks and SUVs. There are occasional variations by generation or trim, so it’s wise to double‑check your specific vehicle’s wheel requirements before purchasing new wheels or adapters.
How to confirm your bolt pattern
Before you buy wheels or spacers, verify the exact bolt pattern for your vehicle. Here are reliable ways to confirm:
- Check the owner’s manual or the tire/wheel specification sticker found on the driver’s door jamb for the lug pattern.
- Inspect the wheel itself or the wheel hub where it mounts to see the lug arrangement and count.
- Use the VIN or model year to look up factory specs on GM’s official parts site or a trusted parts database.
- If in doubt, measure directly: measure the circle that goes through the centers of all lug holes (center to center across the circle) to confirm the diameter in millimeters or inches.
Once you’ve confirmed the bolt pattern, you can proceed to select wheels that match that spec. Mismatched patterns can cause safety issues and improper seating of the wheel.
Summary
For Chevy and GMC trucks and large SUVs, the common bolt patterns are 6x139.7 mm (6x5.5 inches) for most light‑duty models and 8x165.1 mm (8x6.5 inches) for heavy‑duty variants. Always verify your exact year, model, and trim—either via the owner’s manual, a vehicle sticker, or a reputable parts database—to ensure compatibility before purchasing wheels.
