[suicideneil]

During racing you dont really have time to think about shifting gears anyway, so it makes more sense to keep it as a single speed. A 2speed is only much good if you like to do low speed driving/crawling, have an underpowered motor, an outrunner that needs the lower ratio to get itself started turning, or an insanely overgeared high powered setup that needs the lower ratiom to get started too = high speed runs.