He is my findings. Side by side comparison. OEM sprocket(20k miles on it) weighs 1724g/3.8lbs. JT sprocket carrier with Superlite steel sprocket (feels like it has a hard coating on it as well)mounted weighs 1062g/2.34lbs. They both are 45 tooth. The OEM is for a 525 chain, the Superlite is a...