According to the Web site (http://www.derbi.es/eng/modelos/modelos.htm) the revolution has a max of 5,8 CV a 7.500 r.p.m (i'm not sure how that translates), but I heard from someone that this moped can ride around 50 mph. I'm just so disappointed with my tomos...(has biturbo exhaust, 27 tooth speedo, enlarged jet; runs anywhere from 40-50 mph depending on the weather, but the accerlation is slow as hell). Right now, I'm kinda leaning towards the Derbi revolution GS instead of the ZUma, b/c they both have almost the same components and I know that the derbi would probably be easier to sell later on. Anyways getting a zuma requires me to get a motorcycle lin, but I don't think the cops would care about it.