Very nice mod that has dirtbikes in it for single player.
2 textures-default(desert) and woodland.
3 camera views. (best driven in 3P view).
pro's.
fast, maneuverable, bots use them they climb most hills,+1 passenger.
con's.
no weapons for driver or passenger, destroyed with one anti vehicle projectile.
install
1.open the zip and drag the folder into your bf2 or mod directory. eg. GAMESBattlefield 2modsf2BF2_dirtbike
2.replace the archive files with the inculded ones or copy the top lines from the archive files and paste at the top of your own mod archive files.
3.open the GamePlayObjects.con and replace any vehicle name with dirtbike.
if you don't want use the archive way you can extract the contents and put it in your own mod since there is only one object it should be easy enough.
Thanks to CrazyAce for testing it