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
Dual-sport motorcycle a 250 cc two-stroke engine. Other manufacturers soon followed with similar models called "enduros". These light weight machines were good on trails and adequate on pavement. Some manufacturers approached the trend from the opposite direction, beginning with a street motorcycle and modifying it for adequate off-road performance. For instance, the Honda CL350 Scrambler was a variation on the Honda CB350 street motorcycle with high exhaust pipes, a larger front wheel, dirt-oriented tires, and lower gearing. Over the next 20 years, manufacturers began producing heavier and less dirt worthy enduros based on four-stroke engines, as they searched for better combinations of