Choice 2pc ACB4252H7 Headset Bearing 42*52*7 MM 45/45 Angular Contact 1-1/2 Inch Bicycle for Bike Frame Hea

Specification

The most accurate method is to measure the old bearing. Use a caliper to measure its inner diameter, outer diameter and width. You can also refer to the technical manual of your vehicle frame.

Item : ACB4252H7
Type : Angular Contact Bearing
Inside Diameter : 42 mm
Outside Diameter : 52 mm
Thickness : 7 mm
Inner Chamfer : 45 degree
Outer Chamfer : 45 degree
Qty: 1 Lot = 2 Pcs

Overview

This product is an ACB4252H7 bicycle head tube (suspension) bearing set. It is a double-row angular contact ball bearing with a specification of 42×52×7mm. It adopts a 45°/45° double-row angular contact design and is the standard configuration bearing for the bicycle head tube (suspension) and the front fork pivot point.

ACB4252H7 is a common bearing model for the bicycle industry. It is widely used in the head tube positions of various mountain bikes, road bikes, and folding bikes. This bearing features a 45°/45° double-row angular contact design, which enables it to withstand both radial loads and bidirectional axial loads simultaneously. It is particularly suitable for the complex force conditions generated during bicycle riding.

Why do bicycles need special bearings for the head tube?

The head tube (Headset) is a crucial component that connects the front fork and the frame, performing both the steering function and the transmission of the front load.

The working characteristics of the head pipe bearing:
Combined load: Bearing the rider's weight (radial force), the forward force during braking (axial force), and the lateral force during turning.
Bidirectional rotation: Left and right steering, non-continuous one-way rotation
Vibration impact: The impact load transmitted by road bumps
Environmental exposure: erosion by rainwater, silt, and dust
Double-sided sealing effectively prevents sand from infiltrating.