Pro Stock Motorcycle Pro Stock Motorcycle 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. The class has for years been dominated by inline-4 cylinder Suzuki based bikes but in recent years Harley-Davidson based V-twin machines have become more competitive due to favorable rule changes (160 c.i. Harleys vs. 107 c.i
Royal Purple (lubricant manufacturer) jumps on top of is a Royal Purple delivery van. The driver slams on the brakes and dumps Salt onto the road in front of the stopped van. In the 2013 movie "Safe Haven" by Nicholas Sparks, Josh Duhamel wears a Royal Purple motor oil T-shirt. Royal Purple (lubricant manufacturer) Royal Purple is an American manufacturer which produces lubricants for automotive, industrial, marine, motorcycle, and racing use. It is known primarily for its line of synthetic Royal Purple Motor Oil products used in gasoline and diesel engines. They also produce other fluids including gear oil, transmission fluid, power steering fluid