Pro Stock Motorcycle, formerly known as Pro Stock Bike, is a Motorcycle Drag Racing class that is the two-wheeled equivalent of Pro Stock  It has been a feature of NHRA drag racing since the 1980s when it was added to the professional class structure and has since spread around the globe. The first points championship season was the 1987 NHRA season. Frames are purpose-built specifically for drag racing and are not based on their road-going counterparts.