Culprit Adjustable Between the Arm Riser with Under carbon under the cup Bridge

Super adjustable BTA riser made from 6061 alloy. It has 9 mm increments from 101 mm to  146 mm in height. Angle adjustment in fixed 5 degree adjustments from 5 to 30 degrees. 

Choose from 3 widths of carbon bridges made of 6 mm T700 carbon.  Very stiff and refersible to add or reduce BTA positon