Aprilia RS50 Best PictureThe Aprilia RS50 is a GP derived replica sport production motorcycle made by Aprilia. It is powered by a single cylinder 2-stroke aluminium cylinder block, liquid cooled 50cc AM6 engine. The bike is popular in countries that have restrictions on motorcycle engine size. The bike is 7/8ths the size of the average bike and is perfect for smaller or shorter riders. At 175lbs. dry weight, it can be supported by almost anyone. It is a favorite among teenage riders for this reason.