Renthal sr4 120 ultralite alloy chainringborrowing technology from their championship winning motocross sprockets renthal 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 sr4 chainring featurescomputer aided ultralite design enables the ultimate combination of strength and lightness high strength 7075 t6 aluminum alloy provides exc