OEM wheel and tire fitment specs for the 2012 Buick Regal, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
Recorded OEM specifications for the 2012 Buick Regal, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
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.
Donor vehicles with overlapping OEM specs
These are vehicle-year records whose recorded OEM ranges overlap this 2012 Buick Regal. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 19 donor years. Listed 19 eligible overlaps (not all evaluated years are compatible). Showing all listed.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Dataset suggestionHub-centric rings ≈ 70.3 → 66.9 mm – not a verified installation requirement.
Hub-centric rings of about 70.3 → 66.9 mm mm may be relevant if the wheel bore is larger than the hub; they cannot enlarge a smaller bore. Approximate position vs the mid OEM package: outer change 6.18 mm, inner change 0.17 mm. This uses aggregated width/offset ranges, not a specific wheel.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Recorded vehicle-side thread for the 2012 Buick Regal is M14x1.5. This donor year is recorded as 1/2"-20UNF. 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.
Dataset suggestionHub-centric rings ≈ 70.3 → 66.9 mm – not a verified installation requirement.
Hub-centric rings of about 70.3 → 66.9 mm mm may be relevant if the wheel bore is larger than the hub; they cannot enlarge a smaller bore. Recorded vehicle-side thread differs (1/2"-20UNF on the donor year vs M14x1.5 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.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Approximate position vs the mid OEM package: outer change 5.18 mm, inner change 1.17 mm. This uses aggregated width/offset ranges, not a specific wheel.
Check wheel configurationWheel bore may need hub-centric rings; clearance unverified
Bolt pattern5x115 · Same recorded PCD
Center bore70.3 mm donor vs hub 66.9 mm
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Dataset suggestionHub-centric rings ≈ 70.3 → 66.9 mm – not a verified installation requirement.
Hub-centric rings of about 70.3 → 66.9 mm mm may be relevant if the wheel bore is larger than the hub; they cannot enlarge a smaller bore. Approximate position vs the mid OEM package: outer change 5.18 mm, inner change 1.17 mm. This uses aggregated width/offset ranges, not a specific wheel.
Buick Regal Years With Compatible Wheels
Only years with evidence-based interchange relationships are listed. Adjacent years are not assumed compatible.
Compare a donor vehicle or custom wheel against this 2012 Buick Regal. Use Compare in calculator on a donor row above to fill the donor side of this same calculator.
Compare
Compare wheel compatibility between two vehicles
Wheels from (donor vehicle)
Selected Car:
Custom wheel size (optional)
Tip: change values here to simulate custom wheels and immediately see the impact in the comparison below.
Custom tire size (optional)
Installed on (your vehicle)
Selected Car:
2012 Buick Regal
Compare Rims
Specification
Wheels from
Installed on
Result (Click it)
Bolt Pattern
The total number of bolt holes and the diameter of the circle they form.
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5x115
Center Bore
The hole in the center of the wheel that fits over the vehicle’s hub.
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66.9 mm
Thread Size
The size and spacing of the threads on the bolts or nuts that hold the wheel in place.
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M14 x 1.5
Rim Diameter
The wheel diameter in inches that determines which tire sizes will fit.
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18"
Rim Width
The distance between the inner edges of the wheel is measured in inches.
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8.0"
Wheel Offset
How far the wheel sits inward or outward relative to the hub mounting surface.
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42 mm
Backspacing
Shows how much space the wheel takes up toward the inside of the vehicle.
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-
Wheel Fasteners
The type of hardware used to secure the wheel to the vehicle.
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-
Compare Tires
Specification
Wheels from
Installed on
Result (Click it)
Section Width
The width of the tire from sidewall to sidewall, measured in millimeters.
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Aspect Ratio
The height of the tire’s sidewall expressed as a percentage of its width.
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Diameter
The wheel diameter for which the tire is designed to fit.
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Tire Pressure
The recommended air pressure for safe and efficient driving.
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Overall Diameter
The total height of the tire and wheel combined affects clearance and speedometer accuracy.
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-
Wheel Fitment Parts for the 2012 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.
As an Amazon Associate we earn from qualifying purchases. Product availability and pricing may change.
2012 Buick Regal Wheel Fitment And Interchange Guide | wheelinterchange.com
Known OEM Fitment For 2012 Buick Regal
The values below are confirmed from at least one 2012 Buick Regal configuration. Other trims or option packages may differ. If a value is missing on your vehicle or appears inconsistent, confirm it with the tire and loading label on the driver door jamb, the owner manual, and by using the on-page calculator to compare options before buying.
Bolt pattern
5x120
5 studs on a 120 mm circle
Center bore
66.9 mm
Use hub-centric rings if the new wheel bore is larger than 66.9 mm
Thread size
M14 x 1.5
Match lug nut or bolt seat type to the wheel
OEM wheel diameter
19 in
Observed on at least one trim
OEM wheel width
8.5 in
Observed on at least one trim
OEM wheel offset
ET 45 mm
Observed on at least one trim
Backspacing
6.02 in
Provided value. Measure to verify as width and offset can imply a different backspacing
OEM tire size
235/50R18
Observed on at least one trim or package
Notes and cautions:
The wheel size shown above lists 19x8.5 ET45, while the tire size shown is 235/50R18. This indicates multiple OEM packages existed in 2012. Do not assume your car has the same configuration without checking your door sticker and owner manual.
If your OEM specs differ, use the calculator on this page to set your exact stock size, then compare candidates accurately.
How To Use The Wheel Interchange Calculator
Set Installed on to 2012 Buick Regal. This is your vehicle.
Choose Wheels from for the donor vehicle you want to test. If you do not know the donor, use Custom wheel size and Custom tire size to enter the candidate dimensions directly.
Adjust Custom wheel size:
Rim diameter and rim width are in inches. Offset is in millimeters.
As you change rim diameter, also adjust Custom tire size so overall tire diameter stays within an acceptable range.
Adjust Custom tire size:
Section width in mm and aspect ratio in percent determine the tire’s overall diameter with the chosen rim diameter.
The calculator automatically updates tire diameter when rim diameter changes, so review the comparison after each change.
Review the comparison details:
Check inner clearance change to suspension and brakes and outer position change relative to fender.
Check overall tire diameter difference and the indicated speedometer variance.
Aim to keep overall tire diameter change small, commonly within about 2 to 3 percent of your verified stock size, then confirm real-world clearance with a physical test fit.
Fitment Checklist Before You Buy
Bolt pattern 5x120. Do not attempt 5x120.65 or 5x4.75 patterns.
Center bore 66.9 mm. If the wheel bore is larger, plan to use hub-centric rings sized 66.9 mm to your wheel’s bore. Never use a ring if the wheel bore is smaller than the hub.
Threads M14 x 1.5. Match hardware seat style to wheel seat style. GM OE wheels often use a specific seat profile; verify before purchase.
Offset and backspacing. Use the calculator to ensure inner clearance to struts, spring perches, and brake calipers, and to avoid excessive outer poke past the fender.
Brake clearance. Test fit at least one front wheel. Use clay on the caliper bridge to verify spoke and barrel clearance through full rotation.
Load rating. Wheel and tire load index must meet or exceed the Regal’s GAWR values on the door jamb label.
TPMS. 2012 Regal uses TPMS. Confirm sensor compatibility and programming steps for any new wheels or sensors.
Tires. Keep overall diameter close to stock. Verify that turning lock-to-lock and full compression do not cause rubbing.
Return policy. Only buy from sellers who accept returns if a test fit fails.
Plus Sizing And Common Upgrades
The safest approach is to confirm your exact stock size from the car, then use the calculator to evaluate changes. The examples below are diameter-similar options to evaluate in the calculator and to test fit on the car. They are not guaranteed fits.
If your verified stock tire is 235/50R18 (about 27.3 in diameter), diameter-similar 19 inch options to evaluate include 235/45R19 or 245/40R19. Use the calculator to check inner and outer clearance with your chosen wheel width and offset.
If your verified stock wheel is 19x8.5 ET45, small width changes often need offset adjustments to maintain inner clearance and fender coverage. Use the calculator to see how a 0.5 to 1.0 inch width change affects position.
Wider tires can improve grip but may contact struts, liners, or fenders if offset is not appropriate. Always test fit.
Ride and speedometer. Keep overall diameter change within about 2 to 3 percent of stock to maintain ride height and speedometer accuracy.
Installation Tips
Safety first. Support the vehicle with rated jack stands on solid ground. Chock the wheels that stay on the ground.
Prepare the hub. Wire-brush rust from the hub face and center pilot. The mounting face must be clean and flat.
Dry threads. Install lug nuts dry unless the manufacturer explicitly specifies lubricant. Lubricated threads can lead to over-tightening.
Hub-centric rings. If required, seat the ring fully on the wheel and ensure it is flush before mounting.
Hand start all lugs to avoid cross-threading. Snug in a star pattern, then torque to the specification in your Buick owner manual for M14 x 1.5 hardware.
Re-torque after 50 to 100 miles of driving.
Final clearance check. With the car on the ground, turn steering lock-to-lock and drive slowly over a speed bump while listening for contact.
66.9 mm. If your wheel has a larger bore, use hub-centric rings sized to 66.9 mm inner and your wheel’s bore outer.
Will 5x120.65 or 5x4.75 wheels fit my Regal
No. Stick to the exact 5x120 pattern. Off-pattern wheels are unsafe.
What offset should I use
At least one trim used ET 45 mm with an 8.5 inch wide wheel. Other trims may vary. Use the calculator to model any change in width or offset and verify inner and outer clearance with a test fit.
My door sticker shows a different OEM size than listed here. Which is correct
Follow your door sticker and owner manual. The values above reflect at least one OEM configuration from 2012, and other trims may differ.
Can I run 19 inch wheels
Some 2012 Regal trims were equipped with 19 inch wheels. Confirm your brake and suspension clearance with the calculator and a physical test fit, and match bolt pattern, center bore, and thread size.
Do I need new TPMS sensors
You can often transfer existing sensors to new wheels if compatible. Otherwise, use compatible sensors and follow programming steps for the 2012 Regal.
What is the correct lug nut torque
Refer to the 2012 Buick Regal owner manual or service information for the exact torque spec for M14 x 1.5 hardware. Do not guess. Re-torque after 50 to 100 miles.
Are spacers safe on this car
Use only if necessary to correct clearance, and only hub-centric spacers with the correct 5x120 pattern and proper hardware. Verify thread engagement and consult a professional if unsure.
How close should my new tire diameter be to stock
Common guidance is within about 2 to 3 percent of your verified stock diameter to maintain speedometer accuracy and ride height. Use the calculator to check before purchase.
Methodology and sources
Wheel interchange depends on more than bolt pattern. Where data is available, this site compares recorded OEM values:
Bolt pattern / PCD
Center bore direction (donor wheel bore must not be smaller than the hub)
Wheel diameter, width, and offset against known OEM ranges
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.
