i was watching a bike video the other day and relized that aaron chase had a free-coaster of some sort on his bike. i dident understand it because i thought that was somthing only bmx bikes had. and what else is he had a shifter and gears along with it. i have no clue how it works and would like to try and get whatever he had. i talked to a couple friends and they told me they heard it was some type pvc slide that went over the caseste that was moved over when needed. im still confused. any one have any light to shine on this subject. thanks