Zipp's SL145 Stem boasts 50 pieces of hand-laid carbon and machined aluminum yokes for maximum stiffness, making it perfect for laying down the power. Plus, it uses 4 titanium bolts in the faceplate and 2 in the back for the ultimate combination of lightness and strength. Random fun fact: the Ti bolts are sourced from the same Italian producer used by Ducati's world-famous MotoGP racing program.
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.