Re: Just starting out, but addicted already!
The 9 tooth sprocket is much better for hill climbing and standing start take-offf's from the traffic lights.
From my experience the only disadvantage of the 9T sprocket is that the wear rate on the sprocket teeth is significantly greater than the 11T sprocket.
What i want is a 55T chainwheel sprocket, so i can run the same 5:1 gear ratio using the 11T sprocket.
Having said that, the 9T is only worth a few dollars as a replacement item, and the extra chain wear is compensated by my chain tensioner system.
Once you've had a SickBikeparts shift kit, you'll never go back!