Armor-X Stem cap bike mount X-Mount Stem Cap Mount brings the convenience of the X-Mount Mounting System to cycling. It is securely attached to your bike with easy access. Turn your Smartphone into a bike computer and it works prefectly with our optional heart rate sensor and speed / cadence sensor. Stem Cap Mount allows you to adjust your Smartphone vertically for video recording. You will never miss your excellent moment in your journey. Extremely light weight and easy to install