Zipp Service Course SL-70 XPLR Drop Handlebar - Aluminum, 31.8mm, 40cm, Matte Black, A2Zipp's Service Course SL 70 XPLR. The bar's moniker, XPLR, exemplifies the desire to explore the world with an expanded definition of cycling on a drop bar bicycle from paved roads onto gravel, mud, dirt, and even single track. The Service Course SL 70 XPLR help you go faster by placing your body, starting with your hands, in an optimal "comfort zone" position for hours of rough riding over mixed terrain. Today's riders demand a few things out of