Most dirt bikes wont go over 100km/h because they are geared for off-roading. If you've ever gone 60 km/h off road you'll know it feels insanely fast. As regards the fastest dirtbike. The BMW HP2 has a 125mph claimed top speed in comparison to the KTM Super Enduro's 120mph claimed top speed..
Keep in mind that both these beasts are 100cc+ monsters.
A KTM 250sx is the worlds fastest 250 2 stroke dirtbike.
you
ktm
No, I think the Honda 650cc dirt bike is the fastest or a GP racing bike.
no kawasaki is the fastest as i know
Dodge Tomahawk (Worlds Fastest Bike) 8.3L V10 engine producing 500HP! A Very Very Fast Bike.
Kawasaki ZX14
rm 65
Ktm 125sx
The fastest dirt bike in stock is a Suzuki But most lots of people don't agree they normally think its the ktm that's all a opinion.
RX 2-stroke
suzuki hayabusa