The lightest and strongest front sprockets on the market. Twenty's lightweight steel front sprockets are the lightest and strongest front sprockets on the market. They are 10-15 % lighter than the average sprocket and have self cleaning mud grooves that will extend sprocket and chain life. Precision machined to incredibly tight tolerances that provide perfect synchronicity and accuracy of fit. The S45C Chrome-Molybdenum steel hardened core is refined to give the ultimate combination of strength and solidity along with full heat treatment for increased durability and maximum endurance! Being stronger and longer lasting than stock makes the Twenty lightweight steel sprocket the obvious choice for Motocross, Supercross and Off Road bikes.