Pro vibe 7s stemthe vibe 7s stem is a high performance lightweight oversized 7075 t6 stem used by many top professional riders the vibe 7s features an oversized 31 8mm clamp diameter to reduce flex and increase strength and stiffness the puzzle clamp system evenly spreads load through the clamp area and reduces weight features3d forged 7075 t6 alloy construction increases strength and keeps the weight downinnovative and secure puzzle clamp system evenly spreads load through the clamp area w