InMotion WA512221 Wheel Bearing and Hub Assembly - Rear

Rear Wheel Hub Assembly for GM Applications

The InMotion WA512221 wheel bearing and hub assembly is a direct replacement rear hub built for precise fitment and dependable wheel support. Engineered from OE data and measurements, it is made for select Pontiac, Buick, and Chevrolet rear applications, including Grand Prix, Impala, Monte Carlo, Aztek, Regal, Allure, Century, and LaCrosse models.

Use WA512221 when you need a rear wheel hub assembly that matches the original application dimensions and mounting layout. The design focuses on correct fit, stable wheel mounting, and long service life in standard-grade rear positions.

Key Features

• Rear wheel bearing and hub assembly for select GM vehicles
• Direct replacement design based on OE data and measurements
• Flange bolt hole quantity: 4
• Wheel stud quantity: 5
• Bolt circle diameter: 115.0 mm / 4.53 in.
• Wheel pilot diameter: 70.1
• Brake pilot diameter: 70.5
• Hub pilot diameter: 71.8
• Flange offset: 64.8
• Flange diameter: 150.5
• Rectangular flange shape
• ABS sensor not included

Detailed Description

InMotion WA512221 is a rear wheel bearing and hub assembly designed for vehicles that require a standard-grade OE-style replacement at the rear axle. The hub is manufactured with high-precision processes and strict quality-control criteria to maintain the dimensional accuracy needed for proper wheel mounting and bearing support. This part cross-references Monroe Shocks & Struts (e.g., RW8221) for the same application. For buyers searching for a rear wheel hub assembly for 2000-2005 Chevrolet Impala, 2003-2008 Pontiac Grand Prix, or 2001-2005 Pontiac Aztek, WA512221 provides a direct-fit solution built around the original application measurements.

What It Helps Fix

• Wheel play or looseness at the rear hub
• Noise from a worn rear wheel bearing and hub assembly
• Improper wheel mounting caused by hub wear
• Vibration related to hub or bearing deterioration
• Fitment issues from an incorrect rear replacement hub

Installation Notes and Tips

• Confirm rear position fitment before ordering; this part is for rear applications only.
• Verify bolt circle, pilot diameters, and flange dimensions against the original hub.
• ABS sensor is not included, so confirm your vehicle’s sensor arrangement before installation.
• Inspect related brake and suspension components during hub replacement.
• Professional installation is recommended when replacing a wheel bearing and hub assembly.

Quality Assurance

InMotion manufactures this hub assembly using OE-based measurements and controlled production standards to support accurate fitment and consistent performance. The part is built as a direct replacement for the listed rear applications, including Pontiac Grand Prix, Chevrolet Impala, and Buick Regal models.

• Fits 2003-2008 Pontiac Grand Prix, Rear, Standard Grade
• Fits 2005 Buick Allure, Rear, Standard Grade
• Fits 2004-2005 Buick Century, Rear, Standard Grade
• Fits 2005 Buick LaCrosse, Rear, Standard Grade
• Fits 2000-2005 Chevrolet Impala, Rear, Standard Grade
• Fits 2003-2005 Chevrolet Monte Carlo, Rear, Standard Grade
• Fits 2001-2005 Pontiac Aztek, Rear, Standard Grade
• Fits 2003-2004 Buick Regal, Rear, Standard Grade