The Trek RCS Headset Spacer is a 15mm, two-piece component designed to facilitate easy adjustments to your bike’s handlebar height without the need to disconnect brake and shift cables. Its two-piece design allows for straightforward installation and removal, making it particularly useful for bikes with internally routed cables. This spacer is compatible with Trek’s RCS (Road Control Center) headset system and is finished in black to seamlessly integrate with your bike’s aesthetics.