2018 Buick LaCrosse Wheel Interchange

2018 Buick LaCrosse Wheel Fitment Guide | wheelinterchange.com

Known OEM Fitment For 2018 Buick LaCrosse

The values below are the known specifications for at least one factory wheel and tire package on the 2018 Buick LaCrosse. Trims and option packages can vary. If anything on your vehicle differs from what you see here, confirm against your door-jamb tire placard, your owner’s manual, and the on-page calculator before buying parts.

Note: The wheel size shown above is 19x8.5 while the tire size shown is 235/50R18. That mix suggests the data may represent more than one factory configuration. Your car may have come with 18 inch or 19 inch wheels depending on trim. Verify your exact original equipment sizes with the vehicle placard and OEM resources, then use the calculator to model any changes.

How To Use The Wheel Interchange Calculator

• Set Installed on (your vehicle) to 2018 Buick LaCrosse.
• For Wheels from (donor vehicle), either select a vehicle you are considering as a donor or enter a Custom wheel size and Custom tire size.
• Enter or adjust Custom wheel size values: rim diameter, rim width, and wheel offset. Enter or adjust Custom tire size values: section width and aspect ratio.
• When you change rim diameter, the calculator updates overall tire diameter in the comparison so you can see how the change affects ride height and speedometer behavior.
• Review the comparison to understand inner and outer position changes and overall tire diameter differences, then confirm clearances on the car before purchasing.
• Use your vehicle’s OEM specs as your baseline. If your door placard shows a different size than the table above, use your placard value in the calculator.

Fitment Checklist Before You Buy

• Bolt pattern must match exactly: 5x120. Do not attempt to fit 5x115, 5x114.3, or 5x120.65 patterns.
• Center bore should be hub-centric to 67.1 mm on the Buick hub. If the wheel center bore is larger, plan on hub-centric rings sized to your wheel’s bore down to 67.1 mm.
• Fasteners use M14 x 1.5 threads. Match the lug seat style to the wheel manufacturer’s requirement. Seat style is not provided here, so confirm with the wheel maker or inspect an OEM lug.
• Offset and backspacing influence inner clearance and outer poke. Start with the known OEM reference of ET 40 mm and backspacing 5.82 in, then use the calculator to see how changes affect clearance.
• Brake and suspension clearance: measure from the current inner wheel barrel to the nearest strut or control arm. Any reduction in inner clearance from your new setup should still leave safe space when the tire deflects.
• Fender and liner clearance: at full steering lock and over bumps, the outer edge of the tire should not contact fenders or liners. The calculator shows position changes so you can pre-check.
• Tire load index and speed rating should meet or exceed your OEM placard.
• TPMS: plan to transfer sensors or buy compatible new sensors, then perform a relearn per your owner’s manual or with a proper tool.
• Never force-fit hardware. If anything does not seat flush by hand, stop and verify parts.

Plus Sizing And Common Upgrades

Plus sizing changes wheel diameter and tire aspect ratio to keep overall tire diameter close to stock. This can improve appearance and handling if done correctly. Exact fitment depends on your trim, brakes, and suspension, which are not fully specified here, so always verify with the calculator and a physical clearance check.

• From an 18 inch baseline like 235/50R18, a common plus-one to test in the calculator is 19 inch with a lower aspect tire, for example 245/45R19. This is only an example to model, not a guarantee of fit.
• Some owners explore 20 inch setups. An example to model is 245/40R20. Confirm clearance, offset, and load rating carefully.
• Wider wheels can improve grip but may need offset changes to clear inside components while avoiding fender contact. Use the calculator to balance inner clearance and outer poke, then measure on the car.
• Winter downsizing: a smaller wheel with a taller tire can improve ride and snow traction. Verify brake clearance and use the calculator to keep overall diameter similar to OEM.

Installation Tips

• Test fit one front and one rear wheel before mounting tires. Spin the wheel by hand to confirm brake and suspension clearance.
• Clean the hub face and wheel mounting pad. Remove rust and debris so the wheel sits flush.
• If using hub-centric rings, install them fully seated and dry. Do not stack rings.
• Hand-start all fasteners and tighten in a star pattern. Use a calibrated torque wrench to the OEM specification from your owner’s manual.
• After installation and a short drive, recheck torque. Monitor for any vibration which could indicate an out-of-balance assembly or lack of hub centering.
• Complete TPMS relearn according to the Buick procedure or with a compatible relearn tool.

Tools And Helpful Supplies

• 1/2 inch drive torque wrench
• M14 x 1.5 lug nuts - confirm seat style matches your wheels
• 67.1 mm hub-centric rings - match your wheel’s larger bore to 67.1 mm
• GM TPMS relearn tool

FAQs

• What is the bolt pattern on the 2018 Buick LaCrosse?

  5x120. This must match exactly on any replacement wheel.

• What center bore do I need?

  67.1 mm at the hub. If an aftermarket wheel has a larger bore, use hub-centric rings to step down to 67.1 mm.

• What lug thread does it use and what lug nuts should I buy?

  M14 x 1.5 threads. The correct lug nut seat style depends on the wheel design and is not provided here. Verify with the wheel manufacturer or inspect your current lugs before purchasing.

• Will 5x115 or 5x114.3 wheels fit my LaCrosse?

  No. Wheels with 5x115, 5x114.3, or 5x120.65 are not correct for a 5x120 hub and should not be used.

• What offset should I choose?

  The known OEM reference is ET 40 mm. The ideal offset for your setup depends on wheel width and brake clearance. Use the calculator to compare to the OEM baseline and measure clearances on the vehicle.

• What is the factory torque spec for the lug nuts?

  The exact torque can vary by trim and wheel. Check your owner’s manual or OEM service information and tighten with a calibrated torque wrench.

• Will 20 inch wheels fit?

  Fitment depends on offset, width, tire size, and brake clearance which vary by trim. Model a 20 inch setup in the calculator, then confirm physically on the car before buying.

• Do I need to reprogram TPMS if I change wheels or tires?

  Yes. After rotating sensors or installing new ones, perform a relearn per the Buick procedure or with a compatible GM TPMS relearn tool.

Important: If any specification for your specific 2018 Buick LaCrosse is unknown or differs from the values above, use the on-page calculator with your OEM placard data and consult OEM parts catalogs or a Buick dealer by VIN to confirm before purchasing wheels or tires.