Rear High Carbon Steel Sprocket (JTR215.56) by JT Sprockets®. Teeth Quantity: 56. Chain Pitch: 420. JT Sprockets is the world's leading brand of sprockets for motorcycles and ATVs. Using only the finest raw materials and using cutting edge technology in their production, JT Sprockets range gives you the ultimate in replacement sprockets at unbeatable value. JT Steel Sprockets are manufactured using only the finest grade of C49 high carbon steel for the rear sprockets.