Timken HA590066 Wheel Bearing and Hub Assembly - Rear

Timken Rear Hub Bearing Assembly

Timken HA590066 is a rear wheel bearing and hub assembly built for select Chevrolet Cobalt, Pontiac G5, and Saturn Ion applications. It combines OE-developed testing, precision bearing geometry, and integrated ABS sensing to support stable wheel speed monitoring, reduced noise, and consistent braking feel.

Key Features

• Rear, non-driven wheel bearing and hub assembly
• 4-bolt flange and 4 wheel studs
• Bolt circle diameter: 100.00 mm / 3.937 in.
• Flange diameter: 140.00 mm / 5.512 in.
• Wheel pilot diameter: 56.49 mm / 2.224 in.
• Brake pilot diameter: 56.96 mm / 2.243 in.
• Hub pilot diameter: 60.00 mm / 2.362 in.
• Low runout construction helps reduce noise and vibration
• Premium seals are built to resist contamination and support seal life
• ABS sensor is 100% tested for wheel speed monitoring

Detailed Description

Timken HA590066 is engineered for rear axle service on 2005-2010 Chevrolet Cobalt, 2007-2009 Pontiac G5, and 2003-2007 Saturn Ion models. The assembly uses precision-profile bearings with uniform internal geometry and refined surface finishes to support load capacity, bearing life, and fuel efficiency. Its low-runout design helps maintain smoother operation and can reduce brake noise and vibration. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

For shoppers searching for a rear wheel bearing and hub assembly for Chevrolet Cobalt rear, Pontiac G5 rear 4 stud, or Saturn Ion rear fitment, HA590066 provides a direct OE-style replacement path. The integrated ABS sensor is tested to monitor wheel speed for anti-lock braking system operation, while the sealed hub design helps keep contaminants out during normal road use.

What It Helps Fix

• Rear wheel bearing noise or growling
• Wheel vibration caused by hub runout
• ABS warning light related to wheel speed signal loss
• Uneven braking feel from worn hub components
• Excessive play in the rear hub assembly

Installation Notes and Tips

Confirm rear position and non-driven application before ordering. Verify bolt circle, pilot diameters, flange offset, and stud pattern against the original hub assembly on the vehicle. For 2005-2010 Chevrolet Cobalt, 2007-2009 Pontiac G5, and 2003-2007 Saturn Ion applications, inspect the tone ring, ABS connector, and mounting surfaces during replacement to ensure proper sensor reading and hub seating.

Quality Assurance

Timken manufactures hub bearing assemblies using OE-developed testing and controlled design, material, and process standards. The ABS sensor is 100% tested, and the bearing and seal design is built around precision geometry, contamination control, and consistent performance.