Fly Sion BMX BikeFly's Sion was built as the perfect ramp blasting machine, equally capable of handling business when it comes to heavy street riding. With help and input from Larry Edgar, Josh Dove and Sergio Layos the Sion has been built for speed and riding control, with an absolute ton of aftermarket Fly parts, like Fuego Tyres, Volcano Stem, Sierra Seat and more Ruben parts. A full chromoly frame, forks and bars ensure reliable durability from the Sion with front