1-1/8" Straight Steerer Headset, IS41/28.6, IS41/30

The IS41│IS41 headset is designed to fit frames with integrated 41mm head tubes and works with straight 1-⅛” (28.6mm) fork steerers.  The “IS” stands for “Integrated” as the bearing sits directly inside the frame’s head tube without a cup.  The “41/41” stands for the top/bottom inside diameter of the frame’s head tube.    

Features

• U.S. sourced 6061-T6 aluminum
• Machine engraved White Industries logos 
• Easily replaceable Enduro bearings
• “Split” crown race for tool-free installation and removal
• Really sweet matching headset spacers available separately
• Can accommodate “straight 1-1/8” forks with a 30mm crown race seat

More information.