2012 Acura RDX Wheel Interchange

Introduction

This page summarizes wheel and tire fitment for the 2012 Acura RDX. It lists the known OEM dimensions, explains what each spec means, and gives step‑by‑step advice for using the on‑page fitment calculator before you buy wheels or tires.

Do not rely on guesses for fitment. If a value varies by trim or is not shown here, use the calculator and confirm with OEM sources (VIN decode, dealer parts department, owner's manual or the vehicle placard) before installation.

Quick fitment summary (TL;DR)

• Bolt pattern (PCD): 5x114.3 — 5 lugs on a 114.3 mm bolt circle.
• Center bore: 64.1 mm — wheel must either be this size or use a hub‑centric ring.
• Thread size: M12 x 1.5 — lug studs thread pitch and diameter for factory studs.
• OEM rim: 18" x 7.5" with ET (offset) 45 mm (backspacing 5.52").
• OEM tire: 235/55R18 (section width 235 mm, aspect 55%).
• Always verify torque spec and any trim variations from the owner's manual or dealer — torque value is not provided here.
• If you change wheel diameter, use the calculator to compare overall tire diameter and speedometer impact.
• Use the calculator's donor-vs-installed comparison and adjust custom wheel/tire entries to check clearance and scrub radius changes.

How to use the fitment calculator

1. Pick "Installed on (your vehicle)" — confirm the calculator shows 2012 Acura RDX with the OEM specs listed on this page.
2. Choose a "Wheels from (donor vehicle)" option if comparing specific donor wheels (the tool compares bolt pattern, bore, offset and diameter).
3. Or enter a "Custom wheel size": set rim diameter, rim width and offset (ET). The calculator will recalc tire diameter when you change rim size.
4. Enter a "Custom tire size" (section width and aspect ratio) — the tool will show overall diameter and potential rubbing risk.
5. Review the comparison: the calculator highlights bolt pattern, center bore, offset change (mm), and if the tire diameter is within typical tolerance.
6. If bolt pattern or center bore mismatches appear, follow the troubleshooting guidance below before attempting installation.
7. When satisfied, confirm lug nut seat type and thread size (M12 x 1.5 here) and plan to have wheels torqued to the OEM torque spec at install.

What each specification means

• Bolt pattern (5x114.3) — number of studs × diameter of the pitch circle (PCD). Must match wheel; otherwise wheel won't mount.
• Center bore (64.1 mm) — diameter of wheel center hole. Wheel can be larger and use a hub ring, but smaller bore will NOT fit.
• Thread size (M12 x 1.5) — stud diameter and thread pitch. Nuts must match threads and seat type.
• Rim diameter and width (18" x 7.5") — physical wheel size that determines what tire sizes are appropriate.
• Wheel offset (ET 45 mm) — distance from wheel mounting face to wheel centerline. Affects track width and clearance to suspension and fenders.
• Backspacing (5.52") — distance from wheel mounting face to inner lip; useful for checking inner clearance.
• Tire size (235/55R18) — section width (mm), profile (percentage of width), and rim diameter; determines overall diameter and fit.

Mismatch troubleshooting

Bolt pattern mismatch

If the bolt pattern does not match (e.g., wheel is not 5x114.3), the wheel will not properly mount. Do not attempt to modify studs or wheel holes. Solutions: get wheels with the correct bolt pattern or use properly engineered adapters from a reputable supplier (adapters change bolt pattern and have safety/registration implications).

Center bore mismatch

If the wheel center bore is larger than 64.1 mm, use a hub‑centric ring sized to the wheel bore and vehicle hub (wheel bore → vehicle hub), ensuring it seats flush. If the wheel bore is smaller than 64.1 mm, the wheel will not fit and cannot be safely modified — choose a different wheel.

Thread size mismatch

Factory thread size is M12 x 1.5. If aftermarket wheels require different nuts/studs, do not mix mismatched threads. Replace studs or use correctly specified lug nuts for the wheel and stud combination. If you are unsure, contact the wheel manufacturer or your dealer.

Offset and clearance issues

A lower ET (more negative/less positive) moves the wheel outward, increasing track and potential rubbing on fenders. A higher ET moves the wheel inward and may contact suspension components. Use the calculator to see the change in offset (mm) and check inner/outer clearance. Small changes (<10 mm) are often manageable; larger changes require mockup or rolling/fender modification and should be evaluated by a pro.

OEM wheel & tire specs — 2012 Acura RDX

Common mistakes

• Assuming any 5x114.3 wheel will fit without checking center bore, offset and brake clearance.
• Mixing lug nut seat types (conical vs mag) — wheel seats must match nut seat type.
• Using the wrong thread pitch nuts on factory studs — this risks stripping studs.
• Ignoring hub‑centric vs lug‑centric fitment — leads to vibration if not addressed.
• Changing tire diameter without checking speedometer and ABS calibration or rubbing at full lock.

Roadside & emergency advice

• If you get a flat, use the factory spare (or a full‑size spare) and the vehicle jack per the owner's manual. Do not drive on a donut at highway speeds — follow the spare's speed limit and distance guidance.
• If a wheel loses lug nuts or a stud breaks while driving, stop as soon as safely possible. Do not continue driving — have the vehicle towed to a shop.
• Hand‑tighten lugs in a star pattern when reinstalling a wheel, then torque to the OEM specification as soon as possible. Do not guess torque — check the owner's manual or dealer for the correct value.
• If you notice vibration after a wheel change, check that hub rings (if used) are seated, lugs are torqued, and wheel/tire balance is correct.

Tools and parts (examples): lug nut socket set and a hub centric ring for 64.1 mm hubs can help at install — example search for parts: M12 x 1.5 lug nuts (search).

FAQ

Q: Can I put 19" wheels on my 2012 RDX?

A: OEM is 18". You can fit larger-diameter wheels, but overall tire diameter, rolling circumference, speedometer error, and clearance must be checked. Use the on‑page calculator to compare diameters and check for rubbing. Also confirm brake clearance and that offset remains acceptable. If OEM torque or exact trim variations are required, confirm with dealer or owner's manual.

Q: How do I confirm bolt pattern and center bore on a used wheel?

A: Count studs and measure the PCD (5x114.3 for this Acura RDX). Measure wheel center bore with calipers or check wheel stamping. If unsure, use the calculator and verify with the wheel manufacturer or a wheel shop.

Q: Are hub rings required?

A: Use hub‑centric rings when the wheel center bore is larger than the vehicle hub (wheel is not hub‑centric). If the wheel bore equals 64.1 mm, rings are not needed. Rings should match wheel bore → hub size precisely.

Q: What lug nut seat type do I need?

A: The thread size is M12 x 1.5. Seat type (conical/taper, ball/mag) depends on wheel design. Confirm wheel seat type and use the correct lug nuts — wrong seat type can damage wheel and loose fitment.

Q: Where do I find torque specifications?

A: Torque specs are not provided here. Check the 2012 Acura RDX owner's manual, the dealer service information, or a trusted repair manual. Do not guess torque values — under‑ or over‑torquing is unsafe.

Safety disclaimer

This page provides general fitment guidance only. Wheel fitment can vary by trim and aftermarket wheel tolerances. You MUST confirm final fitment, torque specifications and compatibility with OEM sources (owner's manual, dealer, VIN decode) and the wheel manufacturer. Improper fitment or installation can cause loss of vehicle control, wheel separation, or injury. If in doubt, have a professional technician perform the inspection and installation.