When you buy a Zinn bicycle, you expect that legendary Zinn performance combining stability and nimbleness with a perfect custom fit. What will surprise you about the Mortirolo Magnesium bike is its incredibly smooth, forgiving, comfortable ride, even on rough asphalt or dirt roads. Yet the torsional and lateral stiffness and low weight of our oversized and elegantly shaped tubes means that the bike leaps forward with your every pedal stroke. Magnesium is 2/3 the weight per unit volume of aluminum, less than half that of titanium and under a quarter that of steel. The AZ61 (Mg-6Al-1Zn) magnesium alloy we use combines low density with high strength and superb vibration-damping characteristics. That means, when mated with a full-carbon fork, you get a comfortable, responsive, and long-lasting machine. It’s beauty and perfect fit to your body round it out to make the perfect bike.