Recorded OEM specifications for the 2004 Buick Regal, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
Baseline mounting dimensions used for interchange decisions.
Multiple OEM configurations exist for this vehicle. Fitment can vary by trim, brakes, and factory wheel package – confirm your exact setup before buying.
Thread-only product links are shopping examples, not verified fits. Seat style is not confirmed here. As an Amazon Associate we earn from qualifying purchases.
These are vehicle-year records whose recorded OEM ranges overlap this 2004 Buick Regal. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 69 donor years. Listed 24 eligible overlaps (not all evaluated years are compatible). Showing all listed.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Recorded OEM bolt pattern, center bore, and width/offset ranges overlap. This is not a guarantee that every wheel from the donor year fits this vehicle.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Recorded vehicle-side thread for the 2004 Buick Regal is 1/2"-20UNF. This donor year is recorded as M14x1.5. That is the vehicle stud/nut thread, not an intrinsic thread stamped on the wheel. Hardware must match this vehicle’s studs and the selected wheel’s seat and engagement. Existing hardware may be reusable if it already matches. Seat style is not in this dataset, so products are not a verified fit.
View 1/2"-20UNF options on Amazon – thread match only; seat style is not verified.
Recorded vehicle-side thread differs (M14x1.5 on the donor year vs 1/2"-20UNF on the target vehicle). Hardware must match the target vehicle’s studs and the selected wheel’s seat. Existing hardware may be reusable if it already matches. Seat style is not confirmed in this dataset. Width/offset ranges overlap; confirm diameter and brake clearance for your trim.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Recorded OEM bolt pattern, center bore, and width/offset ranges overlap. This is not a guarantee that every wheel from the donor year fits this vehicle.
Years grouped because recorded compatibility evidence is equivalent. Each year keeps its own page.
Recorded OEM bolt pattern, center bore, and width/offset ranges overlap. This is not a guarantee that every wheel from the donor year fits this vehicle.
Only years with evidence-based interchange relationships are listed. Adjacent years are not assumed compatible.
Compare a donor vehicle or custom wheel against this 2004 Buick Regal. Use Compare in calculator on a donor row above to fill the donor side of this same calculator.
Compare wheel compatibility between two vehicles
2004 Buick Regal
Example products matched to recorded thread, hub, or spacer dimensions. They are not verified fits. Confirm seat style, thickness, and clearance before ordering.
1/2" - 20 UNF
1/2" - 20 UNF · Thread match only; seat style is not verified
View on Amazon →
1/2" - 20 UNF · Thread match only; seat style is not verified
View on Amazon →
1/2" - 20 UNF · Thread match only; seat style is not verified
View on Amazon →As an Amazon Associate we earn from qualifying purchases. Product availability and pricing may change.
The values below reflect data available for the 2004 Buick Regal. Some trims used different wheel and tire packages. If your vehicle shows different sizes, confirm what is installed on your car and verify with the on-page calculator and OEM sources.
| Bolt pattern | 5x115 |
| Center bore | 70.3 mm |
| Thread size | M12 x 1.5 |
| OEM wheel size | 16 x 6.5 in |
| OEM wheel offset | ET 42 mm |
| Backspacing | 4.9 in |
| OEM tire size | 215/70R15 |
Note: The values show both a 16 inch wheel and a 15 inch tire size, which indicates multiple OEM packages by trim. Check your door-jamb tire placard, the casting on your current wheels, and your owner’s manual to determine your exact factory package, then use the calculator to compare any changes.
The 2004 Buick Regal was available with different factory packages, which is why both a 16 inch wheel and a 15 inch tire size appear in the known data. If you plan to move up in wheel diameter, use the calculator to:
Because exact clearances can vary by brake package and trim, verify every change with the calculator and confirm against OEM references before buying.
What is the bolt pattern for the 2004 Buick Regal?
5x115.
What center bore does the 2004 Regal use?
70.3 mm. Aftermarket wheels with a larger bore should use hub-centric rings to reduce to 70.3 mm.
What is the stock wheel offset?
ET 42 mm is provided for an OEM 16 x 6.5 in wheel. Packages can vary by trim, so verify your exact wheel offset and confirm with the calculator.
My car shows 215/70R15 tires but the wheel spec above lists 16 inch. Is that a problem?
No. The 2004 Regal had multiple OEM packages. Confirm what is on your vehicle via the door placard and your current wheel markings, then use the calculator to compare any new setup.
Can I use a 5x114.3 wheel on a 5x115 car?
No. The bolt pattern should match exactly for safe clamping and proper centering.
What is the thread size and do I need new lug nuts?
Threads are M12 x 1.5. You may need different nuts if the wheel uses a different seat type. Match seat type to the wheel and follow OEM torque specifications.
How much can I change offset or width?
Use the calculator to evaluate inner and outer clearance changes from the OEM baseline. Small changes are often workable, but clearances depend on your brakes, suspension, and tires. Always measure and test fit.
Wheel interchange depends on more than bolt pattern. Where data is available, this site compares recorded OEM values:
A normal wheel spacer does not change bolt pattern. Hub rings cannot enlarge a wheel bore that is smaller than the hub. Brake clearance and tire package fitment still require vehicle-specific checks when not confirmed in the dataset.
