The mass repartition of the lightweight steel sprocket has been done to be quite the same of the aluminium sprocket. The main problem you can have with a heavier sprocket is not a problem of acceleration or "power" the engine has a great torque it's a problem of suspension. In fact with an heavier sprocket you increase the non suspended weight and in some case the suspension have some difficulties to work. And the last question is why travel 3kg (6.6lb - 212 oz) more? You know how many beer it is?
