Boasting superb styling, performance and technology, the Aprilia SX 125 Dirt Bike 2010 embodies what off-road adventure should be. Ideal for younger riders, the SX 125 delivers big bike performance in a lightweight package. Powered by a state-of-the-art two stroke, single-cylinder engine, this Aprilia dirt bike promises an ultra-reliable ride every time. Other features include 17 inch, wide profile wheels, black anodized rims, sophisticated digital instruments, over-sized suspension system and double cradle frame. Aprilia.