2020 Acura MDX Wheel Interchange

tl;dr

The 2020 Acura MDX runs 5x120, 64.1 mm center bore, and M14 x 1.5 studs. OEM wheels are 20x8 ET55 with 6.17 in backspacing. Factory tire size is 245/50R20. Use the on-page calculator to compare donor wheels and custom sizes. Keep inner and outer clearances close to stock, and keep overall tire diameter near OEM. Use hub-centric rings if the wheel bore is larger than 64.1 mm. Confirm brake clearance before downsizing. Torque to the value in your owner’s manual.

Recommendation

Start from the OEM baseline, then adjust in small steps. Match hub fit and stud size first. Then tune width, offset, and tire size with the calculator.

Use the calculator like a tech

• Set Installed on to 2020 Acura MDX. Confirm the OEM line above.
• Enter a donor wheel or pick Custom wheel size. Change width and offset slowly.
• Watch inner clearance to the strut and control arms. Keep it close to OEM.
• Watch outer poke vs the fender lip and liners. Avoid large increases.
• Set Custom tire size to keep overall diameter near stock. The tool recalculates tire diameter as you change rim diameter.
• If the new wheel center bore is larger than 64.1 mm, plan hub-centric rings to 64.1 mm ID.

Hardware and fit checks

• Confirm the lug seat type matches your wheels. Do not mix seat styles.
• Use the torque spec from the Acura owner’s manual. Re-torque after a short drive.
• If downsizing rim diameter, test fit for brake caliper clearance before mounting tires.

Impact

Each change affects clearance, handling, and wear. Plan for balanced tradeoffs.

• Offset and width shift scrub radius and bearing load. Closer to OEM feels most stock.
• More outer poke can improve stance but risks fender rub under compression.
• More inner push can contact struts, sway links, or liners on steering lock.
• Tire diameter changes affect speedometer and ABS logic. Keep close to OEM.
• Heavier assemblies increase unsprung mass and stopping distance.
• Non hub-centric fit can cause vibration at highway speeds.

Risks

• Caliper or knuckle contact if inner clearance shrinks too much.
• Fender-liner rub from extra poke or taller tires.
• Vibration from wheels that are not centered on the 64.1 mm hub.
• Damaged studs from incorrect lug seat or thread pitch. The MDX uses M14 x 1.5.
• AWD stress from large tire diameter mismatch. Keep left to right and front to rear very close.
• TPMS issues if sensors are not transferred or relearned.

Next actions

Checklist

• Baseline: note 5x120, 64.1 mm bore, M14 x 1.5, 20x8 ET55, 245/50R20.
• Calculator: compare your donor wheels to OEM. Aim for similar inner and outer clearance.
• Tires: choose a size that keeps overall diameter near OEM. A small change is usually best.
• Hardware: match lug seat style. Add hub-centric rings if bore is larger than 64.1 mm.
• Test fit: mount a bare wheel. Spin and steer lock to lock. Check all clearances.
• Install: use a torque wrench and follow a star pattern. Re-torque after 50 to 100 miles.

Helpful tools

• Torque wrench 1/2 inch drive
• M14 x 1.5 lug nuts
• Hub-centric rings 64.1 mm ID
• Wheel hanger guide pin M14 x 1.5

If any value is unclear or varies by trim, confirm with the on-page calculator and your OEM service information. This approach keeps the 2020 MDX safe and predictable.