Zipp SL Speed StemStiff, secure, and light weight with a sleek design that compliments any bike. Includes stiff aluminum faceplate and titanium hardware Torx T25 heads for precise torque readings and ease of adjustment. Matte Black finish Zipp QuickView integrated mount available separately 123g (100mm) SRAM Model ID: ST SL S B2 Attributes Stem Material Carbon Stem Weight 123g Steerer Tube 1 1 8'' Handlebar Diameter 31. 8mm Stack Height 41 Face Plate Bolts 4 Primary