42/52mm Integrated Bike Headset, IS42/IS52 Angular Contact Bearing Set,1-1/8" to 1-1/2" Tapered Straight Tube Headset

This bike headset bearing set is designed for integrated headset systems used on compatible mountain bikes and road bikes. It includes an IS42 upper bearing and an IS52 lower bearing for frames with a 41.8 mm upper head tube inner diameter and a 52 mm lower head tube inner diameter.The set is made from aluminum alloy and comes in black, making it suitable for bicycle headset replacement, front fork bearing maintenance, or compatible bike build adjustments. It is intended for use with standard tapered forks and standard straight forks within the listed dimensions. Before installation, check both the frame head tube size and fork specifications to confirm fitment.Specifications:Item Type: Front Fork Bearings AccessoriesMaterial: Aluminum alloyColor: BlackUpper Bearing: IS42Upper Bearing Inner Diameter: 28.6 mm / 1.13 inUpper Bearing Outer Diameter: 41.8 mm / 1.65 inLower Bearing: IS52Lower Bearing Inner Diameter: 40 mm / 1.57 inLower Bearing Outer Diameter: 52 mm / 2.05 inApplicable Frame Head Tube: Upper inner diameter 41.8 mm / 42 mm, lower inner diameter 52 mm / 2.05 inApplicable Fork: Standard tapered fork with upper 28.6 mm / 1.13 in and lower 39.8 mm / 1.57 in; standard straight fork with upper 28.6 mm / 1.13 in and lower 30 mm / 1.18 inPackage Includes: 1 front fork bearings accessory setNote: The actual color may appear slightly different due to monitor settings and lighting conditions. Please allow slight manual measurement deviation for the listed dimensions.

• Integrated Headset Set: This bicycle headset features IS42 upper and IS52 lower angular contact bearings, designed for integrated headset systems on road bike frames.
• Fork Compatibility: Fits both tapered and straight forks; compatible with upper 28.6mm(1.13 in) steerer tubes and lower 30mm(1.18 in)/39.8mm(1.57 in) tapered/straight steerer tubes.
• Frame Fitment: Suits frames with head tube upper inner diameter 41.8mm/1.65in(≈42mm) and lower inner diameter 52mm(2.05in).
• Material: Constructed from lightweight aluminum alloy, the headset bearings offer durable performance for daily riding, headset replacement.
• Multipurpose Use: Designed for mountain bikes and road bikes, this black headset bearing set ensures smooth steering and stable front fork installation.