There are three types of headset in the Record groupset Threadless , Hiddenset and the traditional threaded headset. The Threadless headset has been designed for unthreaded fork steerers. It is extremely light and allows fast sensitive adjustment. It is distinguished by its weight and working life. The Hiddenset headset is integrated into the head tube of the frame, conferring an extremely elegant look to the bicycle. Light, smooth, long lasting and easy to install, the Record headset is available in the standard version or with a TTC cap. internal headset for unthreaded fork tube version 1-1/8 height 5.9 mm, version 1-1/8 TTC height 15.9 mm patent pending system composite and light alloy fixing screw and cap. BC 1 x24tpi height 36.5mm grease-port for fast lubrication. cup and cone system easy cleaning and maintenance light alloy with steel inserts weight savings and strength Weight 104g BC 1x24tpi height 36.5mm