2021 Acura RDX Wiper Sizes, Bulb Sizes & Tire Sizes

Last reviewed September 30, 2026

The short answer

The 2021 Acura RDX takes 26" driver and 18" passenger wiper blades (rear 12"), has sealed LED headlights with no replaceable low-beam bulb, and rides on 235/55R19 tires as standard (Base, Technology Package, Advance Package); A-Spec Package uses 255/45R20.

Wiper blade sizes

Driver side 26" · j-hook connector Shop on Amazon
Passenger side 18" · j-hook connector Shop on Amazon
Rear 12" Shop on Amazon

Tire sizes by trim

Base, Technology Package, Advance Package (standard) 235/55R19 101H · 33 psi See tires at Amazon
A-Spec Package 255/45R20 101V · 36 psi See tires at Amazon

The size on the placard inside the driver's door jamb is the one your car left the factory with. Match that, not this table, if they differ; a previous owner may have changed wheels.

Bulb sizes

Low beam Sealed LED, no replaceable bulb
High beam Sealed LED, no replaceable bulb
Fog light Sealed LED, no replaceable bulb
Daytime running Sealed LED, no replaceable bulb
Front turn signal Sealed LED, no replaceable bulb
Brake light Sealed LED, no replaceable bulb
Tail light Sealed LED, no replaceable bulb
Reverse light Sealed LED, no replaceable bulb
License plate Sealed LED, no replaceable bulb

Wheel specs and lug torque

Bolt pattern 5x114.3 mm (5x4.5")
Lug nut torque 80 ft-lbs (108 Nm)
Factory wheel sizes 19x8, 20x8

Key fob, battery and sensors

Key fob battery CR2032 Shop on Amazon

Dimensions, weight and fuel

Fuel Gasoline
Octane 87 minimum, 91 recommended
Fuel tank 17.1 gal (65 L)

Worth knowing about the 2021 RDX

  • Connector. Both front blades use a j-hook connector. A blade of the right length with the wrong connector will not clip on, so check the connector before you buy.
  • Wipers. Rain-X lists a Rock Lock 3 arm for the 12 in rear blade.
  • LED lighting. The low beam, high beam, fog light, daytime running, front turn signal, brake light, tail light, reverse light, license plate are sealed LED units with no user-replaceable bulb. A failure means replacing the assembly.
  • Bulbs. The rear turn signal is the only exterior light with a replaceable bulb.
  • Tire chains. The manual permits chains or cables, on the drive wheels only, fitted to the standard tire size. Chains for this size on Amazon →
  • Tires. Chains go on the front tires only, and because clearance is limited the manual recommends QCC Cobra 1046 cables, while the T155/90D17 compact spare is not on every model.
  • Torque. Tighten lug nuts to 80 ft-lbs in a star pattern with a torque wrench, and re-check after the first 50 miles. This figure is from the owner's manual; an impact gun will overshoot it.
  • Octane. The manual requires 87 octane and recommends 91 for full performance. Regular will not harm the engine; premium is a choice, not a requirement.
  • Fuel. The manual recommends 91 octane premium and warns that fuel below 87 octane can damage the engine.