FSA K-Force Mountain Stem 100mm GreyThe FSA K-Force Stem has reached a new plateau of lightweight weighing in at 150g for the 100mm size. Featuring Monocoque Carbon Fiber construction plus titanium hardware brings you the lightest and strongest carbon stem setup available. Diameter: 31.5mm (28.6mm with shim). 40mm Fork Clamp Stack Height. The Shim to adapt 1 1/4in stem to 1 1/8in steer tube included. UD Carbon Finish. Sizes available 80mm, 90mm, 100mm, and 110mm.840031002518