The top speed of 50cc quad bike is aprrox. 30mph to 40mph. motorcyclesdir.com/
25-27-mph standard top speed for a mini dirt bike
Well it really depends on what size of dirt bike you get. For example: if you get a 50cc bike it will mabe go 20mph, but if you get a 450 it could go from 50 to 60 mph. so to get a definite answer go to your dirt bike companies website, and look at the bikes facts.
A 70cc dirt bike will achieve a top speed of around 40mph
the top end speed is 65mph.
the top speed on a xr80r is about 35mph
80mph
120 mph
50-60mph
Stock around 70mph
A 70cc dirt bike will achieve a top speed of around 40mph
40mph with top of the line parts which is going to cost around $2,000 to go as fast as possible.