On the right hand side of the bmp-2 the wheels rotate but the tracks don't move at all, it looks like it is sliding along the ground.
Intense Mechanized Infantry - PR v1.0 Op. Marlin - YouTube
You can see what i mean at around 11 minutes.
Intense Mechanized Infantry - PR v1.0 Op. Marlin - YouTube
You can see what i mean at around 11 minutes.