The easton haven 318mm stem like the wheels handlebars and seat posts that share its name the haven stem is an all mountain game changer we reached into the bag of tricks that we39ve spent 30 years building and pulled out a 153 gram 85 millimeter fully cnc machined alloy stem that features higher stiffness to weight than any mountain stem we39ve ever made distributed stress and top lock technologies optimize barstem interface by removing stress risers and eliminating rocking caus