Zipp sl speed stemthe zipp sl speed stem sets the standard for performance and style thanks to its unidirectional carbon fibre construction created using the same exogram technology that is used in sram red cranksets weight is reduced to a featherweight 123g for the 100mm version despite this low weight the sl speed stem still exceeds zipps best in class stiffness to weight standards it would be the perfect addition to any hill climbing enthusiasts road bike and its also durable enough t