When stiffness and weight are the top on your list, you want Ritchey's Carbon Matrix C-260 Stem. The C-260 is 3D forged from 7050 aluminum with a carbon exoskeleton to enhance rigidity. Even the steel M4 bolts shave a few grams with no sacrifice in strength. This revolutionary design starts with a bar clamp that wraps a full 260-degrees around the handlebar to distribute clamping stress evenly through the handlebar, faceplate, hardware and stem body. The steer tube clamp uses three bolts and a curved slot to reduce clamp stress on the steer tube, so you can run carbon bars and a carbon steerer with no problem.