OEM wheel and tire fitment specs for the 2013 Buick Regal, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
Recorded OEM specifications for the 2013 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 2013 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 2013 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 2013 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:
2013 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 2013 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.
2013 Buick Regal Wheel Fitment Guide
Known OEM Fitment For 2013 Buick Regal
The values below are the confirmed specs we have for at least one 2013 Buick Regal trim or package. Other trims may use different wheel and tire sizes. If a value is not listed, or you see both 18 inch tires and 19 inch wheels, that indicates multiple factory configurations in 2013. Always confirm your exact build using your door jamb tire placard, VIN lookup, and the on-page calculator.
Spec
Value
Notes
Bolt pattern
5x120
5 studs on a 120 mm pitch circle
Center bore
66.9 mm
Hub pilot diameter
Thread size
M14 x 1.5
Verify lug nut seat style matches the wheel
OEM wheel size
19 x 8.5
Width x diameter in inches
Wheel offset
ET 45 mm
Positive offset
Backspacing
6.02 in
Calculated from width and offset in our tool
OEM tire size
235/50R18
Indicates at least one trim used 18 inch tires
Why you see 18 inch tires and a 19 inch wheel here: Buick offered different wheel-tire packages in 2013. Treat the values above as individual confirmed data points. To identify your exact OEM size, read the tire placard on the driver door jamb and verify with a VIN-based OEM parts catalog. Use the calculator on wheelinterchange.com to compare any alternatives to your specific OEM setup.
How To Use The Wheel Interchange Calculator
Pick Wheels from (donor vehicle) - Enter the wheel and tire you are considering. If you have aftermarket specs, use Custom wheel size and Custom tire size.
Pick Installed on (your vehicle) - Enter your verified OEM size from your door placard or OEM catalog.
Adjust Custom wheel size - Change rim diameter, width, and offset to match the wheel you want to test.
Adjust Custom tire size - Change section width and aspect ratio. When you change rim diameter, the tool updates overall tire diameter in the comparison so you can keep it close to stock.
Review clearances - The output shows inner clearance to strut and knuckle, and outer position relative to the fender. Aim to avoid reducing inner clearance and avoid excessive poke past the fender edge.
Mind overall diameter - Try to keep overall tire diameter within about 3 percent of your verified OEM to protect ABS, speedometer, and gearing behavior.
Brake and hub checks - Visually confirm spoke and barrel clearance to calipers, and confirm hub bore compatibility. The Regal uses a 66.9 mm hub. If your wheel bore is larger, plan for hub-centric rings.
Fitment Checklist Before You Buy
Bolt pattern - Wheel must be 5x120. Do not use 5x120.65 or 5x4.75 patterns.
Center bore - 66.9 mm hub pilot. Use hub-centric rings if the wheel bore is larger. Never force a smaller bore.
Lug thread - M14 x 1.5. Match lug nut seat style to the wheel design and use the correct shank or conical seat as specified by the wheel maker.
Diameter and width - Confirm with the calculator that your chosen diameter and width do not reduce inner clearance or cause outer fender interference.
Offset and backspacing - Keep the wheel located close to OEM to avoid scrub radius and bearing load issues. Verify with the calculator.
Brake clearance - Check caliper spoke clearance and barrel diameter, especially with smaller offset or smaller wheel diameters.
Tire overall diameter - Keep within about 3 percent of your verified OEM diameter. The calculator shows the difference.
Load index and speed rating - Tires must meet or exceed the OEM placard load index and speed rating.
TPMS - Plan for sensor transfer or new programmable sensors and a relearn procedure.
Hardware - Use correct-length, correct-seat lug nuts, and do not mix mag-seat and conical-seat hardware.
Plus Sizing And Common Upgrades
Plus sizing aims to increase wheel diameter and width while keeping overall tire diameter close to stock. Because the 2013 Regal appears in both 18 inch and 19 inch factory configurations, verify your baseline on the door placard, then test sizes in the calculator before purchasing.
If your placard shows 235/50R18 - That tire is about 27.3 inches in overall diameter. Example calculator tests that keep diameter close include:
235/45R19 - Approximately 27.3 in overall diameter - very close to stock
245/40R19 - Approximately 26.7 in - about 2.0 percent smaller
255/35R20 - Approximately 27.0 in - about 1.0 percent smaller
These are examples to try in the calculator. Final fitment depends on wheel width, offset, and your brake-suspension package.
If your placard shows a 19 inch OEM wheel such as 19 x 8.5 ET45 - Keep offset near OEM and verify tire width clearance. A 245 section tire may require careful checking of inner and outer clearance. Use the calculator and measure on the car.
Important: Treat these as starting points for calculator comparisons, not guarantees. Always confirm brake clearance, fender clearance at full lock and full bump, and that the tire load index meets or exceeds the placard.
Installation Tips
Test fit first - Mount a front wheel by hand and spin it to check caliper and knuckle clearance before installing tires on new wheels.
Clean hubs - Remove rust from the hub face and pilot with a wire brush for proper seating. Lightly anti-seize the hub pilot only if allowed by your service manual.
Use hub-centric rings - If your wheel bore is larger than 66.9 mm, install rings that reduce the bore to 66.9 mm to minimize vibration.
Lug nuts - Verify M14 x 1.5 thread and correct seat type. Start lugs by hand to prevent cross-threading.
Torque - Tighten in a star pattern in 2-3 stages. Use the torque spec from your Buick owner manual or service manual for your trim. Re-torque after 50-100 miles.
TPMS - Transfer sensors with new seals or install new sensors and perform the GM relearn procedure per the owner manual or a service tool.
Road test - Check for rubbing at full lock both directions and over bumps. Inspect after the first drive.
What center bore do I need for aftermarket wheels?
66.9 mm hub pilot. If your wheel has a larger bore, use hub-centric rings sized to 66.9 mm inner diameter and your wheel bore outer diameter.
What lug nuts does the Regal use?
M14 x 1.5 thread. Seat style depends on the wheel design. Use the seat type specified by the wheel manufacturer, and torque to the spec in your owner manual.
Can I use 5x120.65 or 5x4.75 wheels?
No. Mixing 5x120 wheels with 5x120.65 patterns is unsafe. Use exact 5x120 wheels for proper seating and safety.
What is the stock wheel size for 2013 Regal?
At least one trim used 19 x 8.5 ET45, and at least one trim used 235/50R18 tires. Because 2013 models had multiple packages, check your door placard and use the calculator to confirm your exact OEM size.
How much can I change tire diameter?
As a general guideline, keep overall diameter within about 3 percent of your verified OEM size. Use the calculator to see the exact difference and speedometer impact.
Do I need new TPMS sensors?
You can transfer your OEM sensors if they fit the new wheels or use new programmable sensors. Either way, a TPMS relearn is required. Follow the GM procedure in the owner manual or use a TPMS tool.
What offset range will fit?
It depends on wheel width and your brake-suspension package. Start near the OEM ET 45 mm, then use the calculator to model inner and outer position changes and verify clearances on the car.
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.
