Zipp: Zipp first developed the Service Course SL stem for the fit & performance needs of pros. That goal of being pro grade has proven out over the past several seasons as the stem became a mainstay in the pro peloton & cyclocross circuit being ridden to victory in Paris-Roubaix & the Vuelta a Espana. Now, we take that pro-proven legacy & build on it with the redesigned Service Course SL stem. The Service Course SL Stem, crafted from 7075 aluminum, features a redesigned shape that's strong & lightweight, resulting in a best-in-class 1.85 grams per newton meter of stiffness. That results in no-flex sprints & accelerations. To meet every rider's fit needs, the stem is available in 6 & 17 angles & seven lengths from 70 to 130mm as well as a 140mm length for the 6 stem only.