The hsf stem cap allows the profile design hsf/aeria bottle to be fitted to the standard 1/seventeen stem.Features:the hsf aeria bottle smoothes airflow onto the frame, offering the chance to lower aero drag while increasing hydration carrying capacitythe hsf stem cap was designed to allow more riders to enjoy the speed advantage and convenience of the hsf aeria bottle system - it is a simple upgrade to turn a normal bike into a superbike
