Renthal sr4 ultralite alloy chainring borrowing technology from renthals championship winning motocross sprockets they have designed and developed these chainrings to offer the ultimate combination of lightness strength and durability renthal ultralite chainrings are designed to let you ride faster jump further and last longer renthal sr4 ultralite alloy chainring features computer aided ultralite design enables the ultimate combination of strength and lightness high strength 7075 t6 alum