This mod is for TLAD and GTA IV
Install:
For TLAD:
Open SparkIV
than in sparkiv click OPEN
open: yourgamedir/TLAD/pc/models/cdimages/vehicles.rpf
import files 
rebuild and save
open TLAD 
find bike and drive
For Gta IV:
Open SparkIV
than in sparkiv click OPEN
open: yourgamedir/pc/models/cdimages/vehicles.rpf
import files 
rebuild and save
open gta iv
find bike and drive...
ENJOY