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Simple, elegant, lightweight design can be run in negative or positive position for -17°/ 17° in rise. 3D forged 6061-T6 aluminum combined with a 4-bolt faceplate provides increased stiffness.Features:Performance:- The Sonic/Ergo Is Designed To Present Minimal Frontal Area To Create As Little Aerodynamic Drag As Possible. The Main Purpose Of An Aerobar Is, Of Course, To Get The Rider Into A Fast Position Despite A Fairly Minimalist Appearance The Sonic/Ergo Offers A Comprehensive Fit Range For Exactly This Purpose.Extensions:- The T5 Extension Features A 13° Ski-Bend Designed To Give A Range Of Aerodynamic Hand Positions. Specifications:- Weight: 162g (100mm)- Length: 70, 80, 90, 100, 110, 120, 130mm (±17°)- Material: 3-D Forged 6061-T6 Aluminum- Clamp Diameter: 31.8mm- Angle: 73° (±17°)- Steerer Tube Diameter: 11/8in- Stack Height: 40mm- Clamp Width: 40mm- Clamp Torque: 5Nm- Finish: Matte Black