2018 Chevrolet Impala Wheel Interchange

2018 Chevrolet Impala Wheel Fitment Guide

Known OEM Fitment For 2018 Chevrolet Impala

Wheel and tire specifications can vary by trim and option package. The values below are items that have been observed on 2018 Impala models. If your car’s door-jamb placard or OEM documentation differs, follow the OEM information. Use the on-page calculator to compare any potential change in wheel or tire size before you buy.

Notes:

• Different trims may use different factory wheel and tire sizes. It is normal to see an 18 inch tire size on the door placard while some trims have 20 inch OEM wheels.
• If any of your specs are unknown for your trim, confirm with the door-jamb tire label, the owner’s manual, GM service information, or a dealer lookup by VIN.

How To Use The Wheel Interchange Calculator

The calculator on this page lets you compare a donor wheel and tire setup to your Impala. It also updates tire diameter automatically when you change rim diameter, which makes it easy to see how size changes affect clearance and speedometer error.

• Step 1: In Wheels from (donor vehicle), enter the specs of the wheels or tires you are considering. If you only know wheel size, fill those fields first.
• Step 2: In Installed on (your vehicle), select 2018 Chevrolet Impala or enter your current wheel and tire size from the door placard.
• Step 3: Use Custom wheel size to try different rim diameter, width, and offset. Watch inner and outer clearance changes to strut, suspension, and fender.
• Step 4: Use Custom tire size to adjust section width and aspect ratio. The tool recalculates overall tire diameter as you change rim diameter.
• Step 5: Review the comparison for changes in poke, inner clearance, ride height, and speedometer. Aim to maintain safe inner clearance to struts and control arms and avoid excessive outer poke past the fender.

Tip: If your current settings are unknown or vary by trim, start with the known examples listed above, then verify against your door placard and OEM references.

Fitment Checklist Before You Buy

• Bolt pattern must be 5x120.
• Center bore on the car is 66.9 mm. If the wheel hub bore is larger, plan on hub-centric rings sized to 66.9 mm. If it is smaller, the wheel will not seat correctly.
• Thread size is M14 x 1.5. Use lug nuts that match the thread and the wheel’s seat type. Many aftermarket wheels use a 60 degree conical seat, but verify for your wheel model.
• Width and offset must clear brakes, struts, and fenders. Use the calculator to compare inner clearance and outer poke versus your current setup.
• Tire load and speed ratings should meet or exceed the values on your door placard.
• TPMS: Plan to transfer your sensors or install compatible replacements, then perform relearn according to GM procedures.
• Spacers or adapters are not a substitute for proper offset. If used, they must be hub-centric and may require longer wheel studs. Only use them when necessary and with correct hardware.
• Wheel and tire overall diameter should remain close to stock to avoid speedometer and ABS issues. Use the calculator to keep diameter change small.

Plus Sizing And Common Upgrades

Many owners explore a plus size move such as 18 to 19 or 20 inch wheels. On the 2018 Impala, factory equipment has been observed with both 18 inch tire sizes and 20 inch wheels on certain trims. If you are considering a change:

• Keep overall tire diameter close to stock by lowering the aspect ratio when increasing rim diameter. Use the calculator to visualize the change.
• Control offset changes. A wider wheel with the wrong offset can push the tire into the strut or out past the fender. Compare inner and outer clearance deltas in the calculator.
• Check brake caliper clearance. Some wheel designs have tighter spoke-to-caliper profiles even if diameter is larger.
• Expect ride and noise changes with lower profile tires. Inspect roads you drive most and choose accordingly.

Installation Tips

• Test fit each front and rear wheel on the hub before mounting tires. Check that the wheel seats fully against the rotor hat and spins freely without contacting calipers or suspension.
• Clean the hub face and center pilot with a wire brush. Remove rust scale so the wheel sits flush.
• Do not lubricate wheel studs or use anti-seize on threads unless specified by GM. Torque values are calibrated for dry threads. Always follow the torque spec in the owner’s manual or service information.
• Install lug nuts by hand first to avoid cross-threading. Tighten in a star pattern in two to three stages, then final torque with a calibrated torque wrench.
• If using hub-centric rings, ensure they are fully seated in the wheel and on the hub. Recheck after the first drive.
• Re-torque after 50 to 100 miles of driving.

Tools And Helpful Supplies

• 1/2 inch drive torque wrench
• M14 x 1.5 lug nuts, correct seat type for your wheel
• Hub-centric rings sized to 66.9 mm vehicle hub
• Compatible GM TPMS sensors

FAQs

• What is the bolt pattern on the 2018 Chevrolet Impala?

  5x120.

• What is the center bore for this car?

  66.9 mm. If your wheel bore is larger, use hub-centric rings to 66.9 mm. A smaller bore will not fit.

• What lug nuts do I need?

  Thread size is M14 x 1.5. Match the seat type to your wheel design. Many aftermarket wheels use a 60 degree conical seat. Verify before purchase.

• Will 20 inch wheels fit my 2018 Impala?

  20 inch wheels have been observed on certain 2018 Impala trims, for example 20 x 8.5 ET45. Fitment depends on your trim, brakes, and tire choice. Compare your current setup in the calculator and confirm against your door placard and OEM sources.

• What is an OEM tire size for this model year?

  235/50R18 has been observed on 2018 Impala models. Always verify the tire size on your door-jamb label for your specific trim.

• How do I choose the correct offset?

  Start from a known example like ET45 on an 8.5 inch wheel, then use the calculator to see inner and outer clearance changes relative to your current wheels. Maintain safe inner clearance to struts and avoid excessive outer poke.

• Can I reuse my OEM lug nuts with aftermarket wheels?

  Only if the seat type and thread match the new wheel. Many OEM nuts have a different seat. Check with the wheel manufacturer.

• Do I need new TPMS sensors?

  You can transfer your existing sensors if compatible. If not, use compatible GM sensors and perform the relearn procedure after installation.

• What torque should I use on the lug nuts?

  Follow the torque specification in the owner’s manual or GM service information for the 2018 Impala. Do not guess the value.