Zipp, Service Course SL-OS, Stem, Diameter: 31.8mm, Length: 120mm, Steerer: 1-1/4'', ±4/6/8°, Black

* ±6° stem that fits 1-1/4 inch steerer tubes* Lightweight and stiff with a 1.73g/nm stiffness to weight ratio for better control and responsiveness.* For bikes with 1-1/8 inch steerer tubes, included shims allow stem to be adjusted for ±4° ±6° or ±8° angles.