For most off-road vehicles, their maximum speed can range from 50 to 90 miles per hour, depending on the engine size. If you're looking for a fast ATV, then you should go with a quad with a 1000 cc engine. With a limiter raised to 80 MPH, these quads can reach a top speed of around 130 MPH. You can also find models that go even faster, but these are usually not available to the public due to strict laws in the United States.
On the other hand, ATVs for young people have speed limiters installed so that they can control their speed. These ATVs can reach speeds from barely moving (1 mph) up to very fast running speeds (25 mph). ATV stands for all-terrain vehicle and is designed to handle all types of terrain. So no matter what type of terrain you are driving on, an ATV is designed to handle it.
In conclusion, the maximum speed of an ATV depends on its engine size and other factors. A 1000 cc ATV can reach speeds up to 130 MPH while a 125cc ATV can reach speeds up to 40 MPH. Speed limiters are also installed in ATVs for young people so that they can control their speed.