Dia-Compe IB-1 Integrated Headset 1-1/8

Dia-Compe IB-1 is an integrated 1 1/8-inch headset for frames built to the IS42 standard. IS42 means that the frame has integrated bearing seats with an internal diameter of approximately 42 mm, where the bearings sit directly in the frame’s head tube without separate press-fit bearing cups.

The headset uses sealed 45/45-degree ACB cartridge bearings measuring 41.8 x 30.5 x 8 mm. The crown race is made of 7075 aluminum, and the split compression ring simplifies installation and helps the headset center correctly around the steerer tube.

The top cap is CNC-machined from aluminum and has a height of 8.3 mm. The IB-1 is also gyro-compatible and available in several anodized colors for those who want the headset to be part of the bike’s overall look.

Always check the frame’s headset standard before buying. The fact that a headset is 1 1/8 inches does not automatically mean it will fit. For the IB-1, the frame must be built for IS42, meaning an integrated headset with an approximately 42 mm bearing seat and a 41.8 mm bearing with a 45/45-degree contact surface.

Quick Specs

• Product type: Integrated headset
• Size: 1 1/8 inches
• Standard: IS42
• IS42 means: Integrated bearing seats in the frame with an internal diameter of approximately 42 mm
• Bearings: Sealed 45/45-degree ACB cartridge bearings
• Bearing dimensions: 41.8 x 30.5 x 8 mm
• Crown race: 7075 aluminum
• Compression ring: Split design
• Top cap: CNC-machined aluminum
• Top cap height: 8.3 mm
• Gyro-compatible: Yes
• Weight: Approximately 90 g
• Important: Check that the frame is built for IS42 and 41.8 mm integrated bearings before buying