The   A-Head ST-M30 XLC stem   is clamped to the outside of the fork tube. A thread on the steerer tube is no longer necessary, which offers the possibility for fork manufacturers to create thinner-walled steerer tubes or to use other materials such as carbon for example. The A-Head Set system thus offers a weight advantage and easier assembly. Features : Product name : ST-M30 Mark: XLC Reach: 90mm Weight: 259g (for 110 mm) Materials: 3D forged aluminium Screw materials: steel Direction type: A-Head Fork diameter: 1 1/8". Handlebar diameter: 31.8 mm Angle: -30° / 40°. Use: Road, MTB, City