The new tharsis XC stem is the next evolution of headset design

Specification:

• unique pinch bolt design with headset preload ring enable the headset to be adjusted without the need for a top cap or star nut leaving the fork steerer tube free to take an internal Di2 battery or simply as a method to save weight over a traditional system
• the stem has been designed to take an sm-jc41 Di2 junction box internally and is machined to allow cables to enter the front of the stem under the handlebar clamp
• extra wide bar clamp for additional stiffness
• available in -6 and -17 degree versions to suit 1-1/8? Steerer tubes
• weight: 145g (100mm)