Looking for a super-stiff stem that really makes the grade? Make the intelligent choice and go with a ViceVersa GPa4.8.

Let us school ya: the GPa4.8 is named for the Tensile Modulus of Carbon. If that's too much to wrap your head around, call your high-school physics teacher - you know, the guy with the pocket protector and all the pens - he'll help you.

Anyway, the GPa4.8 is engineered not only for stiffness, but also for safety, which is very smart on a 100kph descent. Special attention has been given to strength, especially in the faceplate design. High-modulus, Venus C7 carbon fiber runs throughout the GPa4.8, resulting in exceptional damping qualities, not to mention a wicked look. Extensions go from 90 to 130mm. Weight at 110 is just 160g. Bore is 31.8mm. Fork steerer OD is 1-1/8" or, for you metric nuts, 28.6mm. You put the screws to the GPa4.8 at a torque of 8Nm front and 8Nm rear. The finish is glossy without being bling-bling. And, of course, the 80° angle allows for a significant rise in your Gpa.