The bontrager pro 7 rise 318mm stem outfit your road bike with the pro blendr stem to provide confident handling and integrated accessory capability the forged alloy construction means you39ll get the stiffness you demand but in a weight that39ll make others jealous bontrager pro 7 rise 318mm stem features the pro level quality 318mm clamp diameter stem weighs less than many carbon stems the 4 bolt dual band clamp securely holds handlebar uses high q