What is the bolt pattern on a Chevy Blazer?
Bolt patterns on the Chevy Blazer vary by model year and generation. The most common configurations across the lineup are 6 on 5.5 inches for full-size K5 Blazers, 5 on 4.75 inches for S-10 Blazers, and a modern five-lug pattern for the current Blazer. For certainty about a specific vehicle, verify the pattern for your exact year and trim.
Full-size K5 Blazer (1969–1994)
This era of the Blazer shares a traditional GM trucks-based lug setup, reflecting its pickup-truck roots.
- Bolt pattern: 6 on 5.5 inches (139.7 mm)
Understanding this pattern is important when sourcing wheels or adapters for classic K5 models, as the six-lug configuration is distinct from the later five-lug setups.
S-10 Blazer (1983–2005)
As GM shifted toward lighter platforms, the S-10 Blazer adopted a conventional five-lug arrangement typical of many GM smaller trucks and SUVs.
- Bolt pattern: 5 on 4.75 inches (120.65 mm)
This five-lug pattern is common among many S-series trucks and their Blazer variants, making wheels from other GM models of compatible era generally compatible with proper offset and bore.
Modern Chevy Blazer (2019–present)
The current Blazer is a unibody crossover built on GM’s newer architectures, and it uses a standard five-lug setup common to many contemporary GM crossovers.
- Bolt pattern: 5 on 120.65 mm (5x4.75 inches) with a center bore typically around 66–66.6 mm
When upgrading wheels on the modern Blazer, pay attention to offset, hub bore, and brake caliper clearance in addition to the bolt pattern.
How to verify the bolt pattern on your Blazer
Since bolt patterns can vary even within a generation, use these steps to confirm for your exact vehicle:
- Check the owner's manual or a factory wheel specification sheet for your exact year and trim.
- Inspect the wheel hub area or the stamping on the back of a wheel to locate the pattern (for example, “6x139.7” or “5x120.65”).
- Physically measure: for a 5-lug pattern, measure the diameter across from the center of one lug hole to the center of the lug hole directly opposite; for a 6-lug pattern, do the same across opposite lugs. This diameter is the bolt pattern (in inches or mm).
- If in doubt, contact a dealer, check the VIN-specific build sheet, or consult a reputable wheel shop with your exact model year and trim.
Accurate verification helps ensure proper fitment, including brake clearance and wheel bore compatibility.
Summary
In summary, the Chevy Blazer’s bolt pattern differs by generation: the classic K5 Blazer uses 6x5.5 inches, the S-10 Blazer uses 5x4.75 inches, and the modern 2019–present Blazer generally uses a 5x4.75 inch (5x120.65 mm) pattern. Always confirm your specific year and trim, and consider hub bore and offset alongside the bolt pattern when selecting wheels or adapters.
