Originally Posted by KoryWitkus
And what is the sprocket adapter for ?
When you first buy the kit, they expect you to install the sprocket on the rear wheel with this device
That rubber metal sandwich-y thing, it's called a RAGJOINT. They put lots of strain on your spokes, are difficult to install correctly (you need the sprocket to be perfectly straight and aligned with the chain), and in general are just not that great.
Sprocket adapters get rid of all these problems but can be very expensive.... about $80 for an adapter and a sprocket that will work with the adapter... there are many kinds of sprocket adapters