Syncros Stem XR1.5 -17 deg. - 31.8mm Black 100mmXR1. 5 stems are designed with a low stack height and negative rise for mountain bikers looking for a low handlebar position. The optimized aluminum construction achieves the perfect balance of strength, stiffness and weight. 3D forged from 7075 alloy and a broad four bolt face plate design creates a better distribution of stress and lowers the clamping force required to secure the handlebar.