When used with 1 1/4” steerers, the ride of the Service Course SL-OS is +/- 6 degrees only.
However, with a 1 1/8” steerer tube, the Service Course SL-OS stem can be installed at different rise angles. Use the included shims to raise or lower your handlebar to the indicated rise angle of 4, 6, or 8 degrees if you have a 1 1/8” steerer tube.
More information can be found in the ZIPP Drop Handlebar and Stem User Manual.