THIS SPORT CHANGES PRETTY MUCH EVERYDAY. PROFILE IS AT THE FOREFRONT MOST OF THE TIME ALSO. HERE THEY OFFER A 9 TOOTH DRIVER FOR ODYSSEY'S CASSETTE HUBS. THE DRIVERS ARE MADE OF TITANIUM. JUST REMOVE THE OLD DRIVER OUT OF YOUR HUB AND SWITCH THE PAWLS OVER TO THIS BABY AND REINSTALL. YOU ARE SET TO JET. DRIVER INCLUDES DRIVER BEARINGS ALSO. **** NOTE **** IN ORDER TO MAITAIN A NORMAL GEAR RATIO IF YOU PLAN TO USE A 9 TOOTH COG YOU SHOULD USE A 25 TOOTH FRONT SPROCKET.