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Zipp SL Speed Stem - 120 mm 31.8 Clamp +/-6 1 1/8" Matte Black B2 Model=XC Stem }SRAM CenterLine Disc Brake RotorZipp SL Speed Stem 120 mm 31. 8 Clamp + 6 1 1 8" Matte Black B2. Zipps SL Speed stem represents the essence of carbon componentry. Its stiff secure and light weight with a sleek design that compliments any bike. Unidirectional carbon Includes stiff aluminum faceplate and titanium hardware Torx T25 heads for precise torque readings and ease of adjustment TECH SPECS Stem Angle (deg) +6 Stem Angle (deg) 6 Length 120 Bar Clamp Diameter (mm) 31. 8 Color