No, it is not. Most states require that the motorcycle has brakes, a mirror and lights, but a speedometer or a tachometer are not typically required. It is difficult to ride without a speedometer simply because you have to obey speed limits. If you don’t have to obey speed limits, then you tend to ride at the speed that suits whatever you are doing and the terrain you are riding on. There are many Speedometer apps available for smartphones, so an alterative to a traditional speedometer is simply a cell phone mount on your handlebars. This can allow you to track your speed, distance, and use navigation while riding.