49cc SkaterX Gas Skate Board - 2013 Model New and improved 2013 model The deck is made of bamboo which is extremely durable and much stronger than fiberglass 49cc gas engine - This is one of the most powerfull 49cc motors on the market. 9 x 3.5 inch Sport Tires - These tires are meant for on and off road use. They are a dual sport tire. The SkaterX is the only model we sell that uses a drum brake. The disc brake stops to suddenly for the SkaterX and make the rider unstable. The drum makes a nice gradual stop.