Download the script here
Download the Star Wars Speeder Bike here (v2.0 here) (by Emad-Tvk)
The default bike model is NRG900 (same model of bike from Emad-Tvk), you can change the model name of the bike that will be the Speeder in the auto generated .ini file.
You can spawn the bike using scripthook's console command: spawn, example:
spawn nrg900
Maybe i will add some cops flying and shooting with Speeder bikes, this can be very cool ^^