Pro's Vibe 7S Road Stem is plenty stiff for maximum power transfer, and light enough for any gram-counter. It's triangular in shape and made of forged aluminum for strength and stiffness. Plus, it has a wide 4-bolt clamp for a great grip on your handlebars.
Stem angle is one of the factors that determines handlebar height. A listed angle of 0 degrees actually provides a rise of 16-20 degrees, depending on the bike's head-tube angle. Flexible, athletic riders prefer lower-rise stems, while recreational riders usually favor higher-rise stems.
Rise: +/- 10 degrees
Clamp diameter: 31.8mm
Steerer size: 1 1/8 inch (shim included for 1-inch steerers).
Weight: 120 grams