KNOLET Front Wheel Hub Bearing Assembly Pair 513121 — 5-Lug with Integrated ABS, Front Left & Right for GM Vehicles

The KNOLET Pair 513121 front wheel hub bearing assembly is a direct-fit, 5-lug replacement with integrated ABS sensor designed to restore quiet, smooth front-end rotation on compatible GM vehicles.

If your vehicle shows steering vibration, noise from the front wheels, or uneven tire wear, worn front hub bearings are a common cause. This KNOLET replacement set is engineered to meet OEM fit and function for a long list of Buick, Cadillac, Chevrolet, Pontiac, Oldsmobile and Saturn models. Each assembly arrives ready to install with the ABS sensor built in and corrosion-resistant coatings to stand up to road salt and wet conditions.

Which cars will accept this hub assembly?

This pair is made for many General Motors platforms from the late 1990s through the 2010s. Always confirm fitment using year, make and model before ordering to avoid returns. The listing replaces several reference part numbers used by dealers and aftermarket suppliers.

• Compatible families include: Buick (Century, LaCrosse, Lucerne, Regal, Rendezvous), Cadillac (DeVille, DTS, Eldorado, Seville), Chevrolet (Impala, Monte Carlo, Venture, Uplander), Pontiac (Grand Prix, Montana), Oldsmobile and Saturn Relay.
• Direct-fit for front left and right axles on listed models when specified as 5-lug with ABS.
• Replaces cross-reference numbers such as 12429204 and 25696347 among others.

How does the KNOLET hub assembly improve driving feel?

Worn bearings often cause rumble, steering wobble, or subtle drag that affects handling and fuel economy. These assemblies are manufactured from high-hardness forged carbon steel and balanced to reduce vibration, restoring smooth wheel rotation and predictable steering feedback.

• Precision machined to OEM-style dimensions for correct wheel alignment and runout.
• Low-friction bearing components for reduced rotational drag and improved efficiency.
• Protective coating and robust seals to limit moisture intrusion and prolong service life.

What technical specs and features should I expect?

Each hub comes preassembled with the ABS tone ring/sensor and five wheel studs fitted to a 3-bolt flange pattern. Critical dimensions are provided so technicians can verify fit before installation.

• Position: Front left and right axle assemblies included in the pair.
• Flange diameter ~5.73 in; hub pilot diameter ~3.57 in; bolt circle ~4.53 in; brake pilot ~2.78 in.
• Five wheel studs, three flange bolt holes, and integrated ABS sensor for plug-and-play replacement.

How easy is installation and what should installers know?

These assemblies are designed for professional or experienced DIY installation. Because they are complete hubs with ABS provision, installation typically replaces the worn hub without needing separate bearing presses or special tooling beyond common mechanic shop equipment.

• Sold as a left/right pair to ensure balanced wear and consistent ABS signals.
• OE-style fit minimizes extra machining or hub rework; torque hub and axle fasteners to factory specs.
• Confirm vehicle fitment using year, make and model before ordering to ensure correct orientation and bolt pattern.

Who this is for: drivers and technicians who need a dependable, direct-replacement front hub bearing assembly for GM sedans, wagons and minivans from the compatible years. If you’re experiencing front-end noise, vibration, ABS warning lights related to wheel speed, or if you’re performing scheduled front bearing replacement, this KNOLET pair provides a cost-effective, OEM-style option that restores handling and reduces noise without complex refurbishment.