2004 Buick Regal Wheel Interchange

2004 Buick Regal Wheel Fitment Guide | wheelinterchange.com

Known OEM Fitment For 2004 Buick Regal

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.

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.

How To Use The Wheel Interchange Calculator

• Set Installed on to 2004 Buick Regal.
• If you know your current setup, enter it exactly. Example: if your car has 215/70R15 tires, select that tire size. If you have 16 x 6.5 ET 42 wheels, enter those values.
• Choose Wheels from for the donor vehicle or enter a Custom wheel size to test diameter, width, and offset changes.
• Adjust Custom tire size if you change rim diameter. The calculator automatically updates tire diameter in the comparison so you can see speedometer impact and fender or strut clearance changes.
• Review inner clearance and poke changes. Ensure the inner edge does not move closer to the strut or spring perch than is safe, and the outer edge does not extend past the fender line.
• Aim to keep overall tire diameter as close to stock as practical to minimize speedometer error. Many installers target a small difference only. Use the calculator to quantify the change.
• Print or save the comparison and verify against OEM documentation before purchasing.

Fitment Checklist Before You Buy

• Bolt pattern must be 5x115. Do not force-fit near sizes.
• Center bore must be 70.3 mm or larger. If larger, use hub-centric rings to step down to 70.3 mm.
• Thread size is M12 x 1.5. Verify your lug nut seat type matches the wheel seat. Do not mix conical, ball, or mag seats.
• Start from the known OEM offset ET 42 mm. Use the calculator to evaluate inner clearance to struts and brakes and outer clearance to fenders.
• Backspacing reference is 4.9 in for the listed OEM wheel. Use this to sanity-check aftermarket specs.
• Confirm brake caliper and barrel clearance with a test fit if possible.
• Match or exceed OEM tire load index and speed rating. Check your door placard for the correct ratings.
• If your vehicle has TPMS, ensure sensors are compatible and properly serviced or transferred.
• Inspect hub faces. Remove rust and debris so wheels seat flush.

Plus Sizing And Common Upgrades

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:

• Keep overall tire diameter close to your current setup. This helps maintain speedometer accuracy and ABS behavior.
• Choose a tire with a lower aspect ratio when increasing rim diameter to maintain overall diameter.
• Evaluate offset changes so inner clearance to the strut and outer poke remain safe for your suspension and fenders.
• Avoid staggered setups on front wheel drive unless you fully understand the handling and rotation tradeoffs.

Because exact clearances can vary by brake package and trim, verify every change with the calculator and confirm against OEM references before buying.

Installation Tips

• Park on level ground, chock wheels, and use a quality floor jack and jack stands at OEM jacking points.
• Clean the hub face and wheel mounting pad. Lightly remove rust with a wire brush and ensure no burrs remain.
• If using hub-centric rings, install rings fully seated in the wheel bore. The ring inner diameter must be 70.3 mm.
• Hand start all lug nuts to prevent cross-threading. Do not use an impact to start threads.
• Tighten in a star pattern. Final torque should follow the factory service manual specification for the 2004 Regal. Do not guess the torque value.
• After installation, spin each wheel by hand to confirm no contact with calipers, knuckles, or liners, then road test slowly and check for rubbing at full steering lock.
• Re-torque the lug nuts after 50 to 100 miles.

Tools And Helpful Supplies

• 1/2 inch drive torque wrench
• M12 x 1.5 lug nuts (verify seat type against your wheels)
• Hub-centric rings 70.3 mm ID (OD must match your wheel bore)
• Jack stands

FAQs

• 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.