Information RK Karting Rear Sprocket. Special tooth shape that makes this sprocket great for karting. Used by many top teams. More efficient and durable for both engine and chain. The sprocket is without a doubt the best sprocket on the market for karting. The sprocket is made of 7075-T6 aluminum, which is extremely strong and has great durability. The sprocket is 20-25% lighter than the standard sprocket and is used by many factory and top teams. The gear teeth on the sprocket have a special shape that ensures efficient power transfer and extends chain life. The gear teeth are co-developed with RK, which ensures the perfect gear tooth shape and less loss of transmission efficiency.