the average spped is 1mph and people like Courtney bratton cant ride them
the MX350 goes around 14 mph
As fast as you want. Again this depends on your gearing, if the track is hard packed, long strights, long jumps with smooth landings, go with a smaller rear, larger front gears, the faster you will go. For deep, thick, heavy, or muddy tracks, you will want a larger rear, and smaller front gears for the torque.
really really slow don't waste you're money on it
it depends on the size liike a 125 is going to go a lot faster then a 70
Depends on the CC
Depends on the make, model and gearing but most 250's will run between 65-75 mph.
The new 1000cc bikes may do 220mph. Officially top speed so far was around 217, according to the website.
14 mph :) :P
14 to 20 miles
it all dipends on the bike
A 70cc dirt bike will achieve a top speed of around 40mph
not very fast
55 to 60 its fast