A. This small sprocket for high-performance racing motorcycle engines is designed for off-road motorcycle modification. It has excellent performance and comes in a variety of specifications. B. In terms of design, it has a delicate structure and can well meet the modification needs of off-road motorcycles, providing strong support for the motorcycle's power transmission and performance improvement. C. It has a wide range of applications and is suitable for various off-road motorcycle modification scenarios. It can effectively improve the motorcycle's power output, allowing riders to experience stronger power and smoother handling during off-road rides. D. In terms of specifications, there are multiple choices of different tooth numbers and sizes for the 420 type, including 10 - 19 teeth for the 420 type. Whether you are looking for specific power performance or need to meet different modification requirements, you can find a suitable small sprocket here. It is quite popular in regions such as Africa, Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East, and is a good choice for off-road motorcycle enthusiasts to make modifications.