You’re not going to win any drag races with the SX, unless the other person is walking or riding a bike. Top speed is about 25 mph, but that is ok. You really wouldn’t want or need it to go any faster. The engine will pull though. Head up a steep hill and you think you’re going to run out of power, but the little Kawie keeps on chugging along. Even with a load of gear, the Mule keeps on going.