The YCF SM155 is our intermediate to expert level pit bike. It features the factory YCF lightweight 12 inch wheels, YCF air filter and adjustable suspension front and back. The engine is made by Zongshen® a Chinese company that was established in 1992 – these are not to be confused with unbranded Chinese pit bikes. Zongshen® manufacture their own engines and are also an Original Equipment Manufacturer (OEM) for established motorcycle brands including Piaggio and Harley Davidson. Their products are well established and parts are usually available at competitive prices.