2015 Buick Regal Wheel Interchange

2015 Buick Regal Wheel Fitment Guide

Known OEM Fitment For 2015 Buick Regal

The values below are taken from available OEM references for certain trims or option packages. This list may be partial. If a spec varies by trim, confirm it on your vehicle, with the on-page calculator, and with OEM sources such as the owner manual or dealer parts catalog.

Notes:

• Mixed entries such as 19 inch wheels and 18 inch tires usually indicate different factory packages across trims. Verify what your specific car left the factory with using its door jamb label, owner manual, and the calculator comparison.
• Backspacing can vary slightly by measurement method and wheel manufacturer. Verify the exact backspacing on the specific wheel you plan to install.

How To Use The Wheel Interchange Calculator

• Set Installed on your vehicle to 2015 Buick Regal. If you know your exact factory wheel and tire size, enter it to establish a baseline. If unsure, start with the values shown above and then adjust to match your door sticker or manual.
• In Wheels from choose the donor wheel you want to compare, or enter its size. The calculator compares geometry relative to your Buick Regal.
• Use Custom wheel size to try different rim diameter, width, and offset. The tool will show inner clearance to the strut and outer poke toward the fender.
• Use Custom tire size to adjust section width and aspect ratio. When you change rim diameter, the calculator updates tire diameter in the comparison so you can keep overall diameter close to stock.
• Watch tire diameter variance. Aim to keep overall tire diameter close to your OEM setup to help speedometer accuracy and avoid rubbing. Always confirm with a physical test fit.
• Record the results, then verify brake caliper clearance, steering lock-to-lock, and suspension compression clearance on the car.

Fitment Checklist Before You Buy

• Bolt pattern must match 5x120.
• Center bore must be 66.9 mm or larger. If larger, use hub-centric rings to step down to 66.9 mm.
• Threads and seat type must match. Threads are M14 x 1.5. Verify lug nut or bolt seat style on the wheel cone vs ball seat and match it.
• Offset and width must clear on both sides. Use the calculator to check inner clearance to strut and outer poke to the fender for front and rear.
• Brake clearance. Confirm spoke and barrel clearance over calipers and rotor hats. Template checks from the wheel maker are helpful.
• Load rating. Wheel and tire load ratings must meet or exceed the vehicle’s GAWR and GVWR requirements.
• Tire overall diameter. Keep it close to your OEM to reduce speedometer error and minimize rubbing. Use the calculator to target a small variance and then test fit.
• TPMS compatibility. Plan sensor transfer or new compatible sensors and a relearn procedure per Buick service info.
• Hardware length and engagement. Ensure proper thread engagement with your M14 x 1.5 hardware and correct shank depth if using aftermarket lug nuts.
• Spacers or adapters only if required and engineered properly hub-centric, adequate hub lip, and with appropriate extended studs or bolts.

Plus Sizing And Common Upgrades

The mixed OEM data above suggests the 2015 Regal may have been offered with multiple factory wheel and tire packages. If your car has 18 inch OEM tires for example 235/50R18 some owners consider a plus-one move to 19 inch wheels. Others may downsize from 19 to 18 for winter or ride comfort. Whether upsizing or downsizing, always verify brake clearance, fender clearance, and load ratings.

• Use the calculator to maintain overall tire diameter as closely as practical when changing rim diameter. Adjust tire aspect ratio and section width to compensate.
• Offset tuning. Wider wheels often need offset adjustments to keep the inner barrel off the strut while avoiding excessive poke. The calculator shows how changes affect inner and outer positions.
• Tire width. Increasing section width improves grip but can contact fenders or liners on compression or at full lock. Compare both front and rear and test fit.
• Ride and handling. Larger diameter wheels generally increase unsprung mass and may reduce ride comfort. Choose a quality, load-rated tire and consider alignment adjustments after installation.

Installation Tips

• Park on level ground, use wheel chocks, and lift at factory jack points. Support the car with jack stands before removing wheels.
• Clean the hub face and the back of the wheel. Remove rust and debris so the wheel seats flush.
• If using hub-centric rings, install them fully seated on the hub or in the wheel bore per the ring design.
• Hand start all lugs, then snug in a star pattern. Torque to the value specified in your owner manual or Buick service information. Do not use impact to final torque.
• Re-torque after 50 to 100 miles of driving and again after any temperature swings.
• Perform a steering sweep lock-to-lock and a short drive over bumps to check for rubbing. Inspect inner liners, strut clearance, and brake hose clearance.
• Complete TPMS relearn per the manual if sensors were changed or moved.

Tools And Helpful Supplies

• 1/2 inch drive torque wrench: Shop options
• M14 x 1.5 lug nuts or bolts to match seat type: Shop options
• Hub-centric rings sized to 66.9 mm vehicle hub and your wheel bore: Shop options
• Digital tire pressure gauge: Shop options

FAQs

• Are all 2015 Buick Regal trims 5x120?

  The known OEM data here lists 5x120. Because trims and packages can vary, verify your specific car’s bolt pattern on the door jamb placard, in the owner manual, or by referencing the VIN in a dealer parts catalog.

• Will 5x120.65 or 5x4.75 wheels fit a 5x120 hub?

  No. 5x120, 5x120.65, and 5x4.75 are different patterns. Do not force fit or rely on wobble hardware. Use the exact 5x120 pattern for proper centering and safety.

• Do I need hub-centric rings for aftermarket wheels?

  If the wheel center bore is larger than 66.9 mm, use rings to step down to 66.9 so the wheel is centered on the hub. Rings do not fix an incorrect bolt pattern or offset.

• What is the largest tire I can run without rubbing?

  It depends on wheel width, offset, and suspension condition. Use the calculator to model inner and outer clearance against your baseline, then test fit and inspect through full suspension travel and steering lock. When in doubt, consult a professional.

• Can I downsize to 18 inch wheels for winter or comfort?

  Downsizing is possible on some trims if the wheel clears the brakes and the tire overall diameter remains close to stock. Verify brake caliper clearance, load rating, and speed rating. Use the calculator to select an 18 inch tire with similar overall diameter.

• Do I need new lug nuts with aftermarket wheels?

  Possibly. Keep the same thread size M14 x 1.5 and use the seat style required by the wheel cone or ball. Confirm that the shank length and head style clear the wheel’s lug holes.

• Is using spacers safe?

  Only when necessary and properly engineered. Spacers should be hub-centric, maintain adequate hub engagement, and be paired with appropriate extended studs or bolts. Recheck torque often. Adapters that change bolt pattern must meet local regulations and be installed by a professional.

• Why does the backspacing number not match my calculation?

  Manufacturers may report backspacing using different lip measurements or rounded offsets. Measure the actual wheel in hand and use the calculator for side-by-side comparisons before committing.