NEWTON stem is built in 2024 T6 alluminium alloy and CNC machined. It is a refined designed, strong and ultra-light. Front clamp diameter (bar bore): 26.0mm, fork steerer diameter 28.6mm (1" 1/8) included sleeve for 25.4 (1") fork steerer. Weigth: 125 grs. Sizes: 100, 110, 115, 120, 130mm.