Wilwood Front A4 Inner Hub Roller Bearing, 1.063-Inch Bore

This Wilwood A4 inner bearing fits the specified front hub arrangement using a nominal 1.063-inch spindle seat. Another Wilwood bearing uses the same nominal bore, but its cup and bearing series differ. Wilwood Engineering, founded in 1977 by Bill Wood, is based in Camarillo, California and designs and manufactures disc brake systems and components. Calipers, brake rotors, master cylinders, valves, fittings, and brake lines form part of its range for motorsport, street-performance, and specialized installations; suitability depends on the full brake-system arrangement.

Technical Details

• Manufacturer part number: 370-3147
• Bearing Material: Steel
• Finish: Bare
• Cone bore: 1.063 inches nominal; 1.0625-inch reference
• Bearing series: A4
• Reference: L44649
• Matching race: 370-3146
• Package: One cone

Fitment & Compatibility

Confirm race 370-3146 and the A4 bearing identification. Wilwood's reference bore is 1.0625 inches; do not use the cone intended for a different 1.063-inch-bore assembly.

Manufacturer Documents

• Wilwood DS719 technical document
• Wilwood product information

Representative product-family image. Confirm the ordered bearing or kit using the part number and specifications.

Discuss the existing setup with PMB Performance before ordering when the application is uncertain. We bring over 20 years of experience to parts selection and fitment support.