2015 Acura RDX Wheel Interchange

Introduction

This page summarizes the factory wheel and tire fitment for the 2015 Acura RDX and explains how to use the on-page wheel/tire interchange calculator to safely compare aftermarket or donor wheels. The goal is safety-first: confirm all critical measurements before mounting, and don’t rely on assumptions — small differences in bolt pattern, center bore, thread pitch, or offset can create dangerous fitment problems.

Where specs vary by trim or are not provided, this page tells you how to confirm them using the calculator, the vehicle door jamb placard, the owner’s manual, or an Acura dealer. Never fit a wheel unless you’ve confirmed the lug size, thread pitch, and hub contact are correct for your vehicle.

Quick fitment summary (TL;DR)

• 2015 Acura RDX factory wheel: 18 x 7.5 in, offset ET 45 mm.
• Bolt pattern (lug studs × PCD): 5 × 114.3 mm (5x114.3).
• Center bore (hub bore): 64.1 mm (hub-centric requirement for some wheels).
• Thread size for studs/lug nuts: M12 × 1.5.
• Factory tire: 235/60R18 (section width 235 mm, aspect ratio 60, 18" rim diameter).
• Backspacing (factory wheel): 5.52 in (as supplied OEM).
• Confirm unknown or trim-variable values (lug seat type, torque spec, spare size) via the on-page calculator, door jamb sticker, or dealer.
• Use hub-centric rings if the donor wheel bore is larger than 64.1 mm; do not rely on lug nuts alone to center the wheel.
• Thread mismatch requires replacing studs or lug nuts — do not use adapters that change thread engagement without engineering verification.
• When in doubt, verify with OEM sources before driving; incorrect fitment can cause vibration, stud failure, or wheel loss.

How to use the interchange calculator

1. Select the donor vehicle (the wheel you want to use) in the left column and confirm its listed bolt pattern, center bore, rim diameter/width, and offset.
2. Verify the right column shows your vehicle (2015 Acura RDX) with the OEM specs pre-filled. If a value is missing or your trim differs, enter the correct OEM number from your door jamb sticker or owner’s manual.
3. Use the “Custom wheel size” controls to test alternative rim diameters, widths, and offsets. Note: changing rim diameter will automatically update tire diameter for comparisons.
4. Use the “Custom tire size” controls to test different tire section widths and aspect ratios. Review overall diameter and speedometer difference readouts.
5. The calculator compares bolt pattern, center bore, and wheel offset clearance. Pay special attention to any red flags (bolt pattern mismatch, bore mismatch, excessive offset change, or tire clearance warnings).
6. If the donor wheel has a larger bore, the tool will recommend hub-centric rings. If the bolt pattern differs, the calculator will flag incompatibility — do not proceed unless an engineered adapter is used and verified.
7. Before purchasing or mounting, confirm lug thread size and lug seat type from your OEM sources and double-check TPMS sensor compatibility — the calculator can show if the wheel/tire combo will maintain acceptable suspension and fender clearances.

What each specification means

• Bolt pattern (5x114.3) — number of studs × pitch circle diameter in mm; wheels must match this pattern or use an engineered adapter.
• Center bore (64.1 mm) — diameter of the hole in the wheel that centers on the hub; a wheel must be hub-centric or use a properly sized hub-centric ring.
• Thread size (M12 × 1.5) — metric lug stud/bolt thread diameter and pitch; lug nuts must match this to ensure proper engagement and torque.
• Rim diameter & width (18 × 7.5 in) — wheel size; tire must be mounted to a compatible rim width and diameter.
• Offset (ET, 45 mm) — distance from wheel centerline to mounting face; affects track width and clearance to suspension/inner fenders.
• Backspacing (5.52 in) — the distance from the wheel’s mounting surface to the rear lip; influences inner clearance (brakes, control arms).
• Tire size (235/60R18) — section width (mm) / aspect ratio (%) / rim diameter (in); determines overall diameter and clearance.

Mismatch troubleshooting

Bolt pattern mismatch

Problem: Wheel bolts/studs don't line up with the vehicle hub pattern.

Fixes and notes:

• If bolt pattern differs, you cannot safely mount the wheel directly. Do NOT force-fit or grind the bolt holes.
• Engineered bolt-pattern adapters exist for some applications, but they change load paths and must be rated for your vehicle's weight and speed — check manufacturer load ratings and local regulations.
• Safer option: find wheels with the correct 5x114.3 pattern or have a professional source compatible wheels.

Center bore mismatch

Problem: Wheel center bore is larger than the hub (wheel won't center) or smaller (wheel won't fit over hub).

Fixes and notes:

• If the wheel bore is larger than 64.1 mm, use quality hub-centric rings sized to fill the gap so the wheel seats on the hub rather than on the lug nuts.
• If the wheel bore is smaller than 64.1 mm, it will not fit — do not machine or force it. Return or replace the wheel.
• Hub-centric rings must be the correct inner/outer diameters and made for automotive use; they are not a structural solution for a bolt pattern mismatch.

Thread size mismatch (M12 × 1.5)

Problem: Donor wheel uses a different stud or bolt thread pitch/diameter.

Fixes and notes:

• Do NOT use mismatched lug nuts or run reduced thread engagement. If thread pitch differs, have the hub studs replaced to match the wheel’s lug nut specification or use wheels that match M12×1.5.
• If studs are replaced, use OEM-length and grade studs, and always torque to OEM spec (see next note about torque).
• Do not invent torque values — confirm the correct lug nut torque in the owner’s manual, door placard, or with a dealer. If unknown, contact an Acura dealer or refer to OEM service documentation before final tightening.

Offset (ET) mismatch

Problem: Offset too high or low can cause fender rubbing or load suspension components differently.

Fixes and notes:

• Small offset differences (+/− few mm) are often tolerated; large changes may cause inner clearance problems or overstress wheel bearings and suspension components.
• If you need more track, spacers can move the wheel outward — use only high-quality, hub-centric spacers with proper bolt engagement and load ratings. Thick spacers increase stress on studs and may require longer studs.
• Always verify brake caliper clearance and wheel tuck under full suspension compression and steering lock using the calculator and a test fit where possible.

OEM wheel & tire specs — 2015 Acura RDX

Note: Some trim levels or aftermarket wheel options may differ. If a trim-specific value is missing for your vehicle (for example, spare wheel size, lug seat type, or OEM torque), confirm using the door jamb placard, the owner's manual, or a dealer.

Common mistakes

• Assuming a wheel with the same rim diameter will fit — diameter alone doesn't ensure bolt pattern, bore, or offset compatibility.
• Relying on lug nuts to center a wheel instead of using hub-centric rings when the bore is oversized.
• Using spacers that are not hub-centric or not rated for vehicle weight — can loosen studs and cause vibrations.
• Ignoring thread pitch differences — mixing threads can strip studs or nuts and cause sudden failure.
• Not checking TPMS sensor compatibility — replacement wheels may need sensors swapped or reprogrammed.
• Assuming aftermarket wheels have the same load rating — verify wheel load rating matches or exceeds the vehicle gross axle weight rating (GAWR).

Roadside & emergency advice

• If you get a flat, use the correct spare and follow the vehicle owner’s jack and lifting points — do not improvise jack points.
• Tighten lug nuts in a star pattern and only to final torque when the vehicle is on the ground. Use a calibrated torque wrench for final torque.
• After changing a wheel, re-torque lug nuts after 25–50 miles (40–80 km) and again periodically for the first 200 miles; check torque after any wheel work.
• If you detect vibration, steering pull, or an irregular noise after changing wheels, stop and inspect immediately — do not continue driving at high speeds.
• Carry basic wheel-change tools: correct jack, jack stands, lug wrench or breaker bar, torque wrench, and a portable tire inflator or pressure gauge.

Suggested tools and parts (examples):

• Torque wrench
• Hub-centric rings
• Replacement M12×1.5 lug nuts

FAQ

Can I use any 18" wheel as long as the rim diameter is 18?

No. You must match the bolt pattern (5x114.3), ensure the center bore is correct or use hub-centric rings, use the correct thread size (M12×1.5), and verify offset/backspacing and brake clearance.

Are hub-centric rings required?

Use hub-centric rings whenever the wheel bore is larger than the hub so the wheel seats on the hub instead of the lug nuts. If the wheel bore equals 64.1 mm, rings are not needed for centering.

What if the donor wheel uses a different thread pitch?

Do not mix thread pitches. Replace studs or use wheels that match M12×1.5. Any modification to studs or bolts must be performed by a qualified technician.

Will TPMS sensors transfer to the new wheels?

TPMS compatibility varies by sensor model and wheel type. Check the sensor part number against the replacement wheel and, if needed, order compatible sensors or have the sensor reprogrammed by a shop.

Where can I find the OEM lug torque and other vehicle-specific specs?

If the torque spec and other trim-specific values are not listed here, check the driver door jamb sticker, the owner's manual, or contact an Acura dealer or authorized service center. The on-page calculator can help identify potential clearance issues, but it does not replace OEM torque specifications.

Safety disclaimer

This information is provided for general guidance only. You MUST NOT rely solely on this page for critical safety decisions. Do not fit wheels unless you have verified bolt pattern, center bore, lug thread pitch, lug seat type, correct torque, and load rating from OEM sources (door jamb placard, owner’s manual, or dealer). Improper fitment can cause wheel detachment, loss of control, or injury. When in doubt, consult a qualified technician or your Acura dealer.