My friend just hooked my up with one of his sick sprocket he makes. Its mounted to a disk hub and completely rubber isolated with stiff rubber. It also has guides that keep it from throwing the chain into the spokes and uses bike chainrings that are interchangeable. The whole thing runs perfectly true.
Here is an older pic of my friends bike... it pulls so hard! hes not online but is named sam and you might run into him in san francisco.
And the sprocket:
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Here is an older pic of my friends bike... it pulls so hard! hes not online but is named sam and you might run into him in san francisco.
And the sprocket:
