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
Motorcycle wheel America were available with alloy wheels as an option. Italian manufacturer Fantic produce a step-through moped named 'Roma' with cast wheels as standard specification in 1975. The Yamaha RD400C sold in 1976 was the first motorcycle by a major manufacturer to be fitted with cast wheels. The cast wheels weighed more than the spoked wheels fitted to its RD350 predecessor. Honda began offering their Comstar composite wheels in 1977, marking the first time a manufacturer had included tubeless tires on a production motorcycle. At the same time as Honda's Comstar, Dawson Harmsworth firm in Sheffield, England produced a similar composite