I think the chain edges would actually ride on the rubber and be pushed
slightly above the trough at the bottom of each tooth of the sprocket
providing some tensioning and noise dampening. Of course, after 30 years or
so, the rubber has turned to ceramic and has NO effect whatsoever except to
puzzle modern day owners.
Glen
>I never could figure out how those were supposed to function. Guess the
> rubber "grew" as RPMs increased thereby causing some mystical tensioning
> of the chain?? The 1275 dbl. row chain/sprockets/harmonic balancer is
> better for your 948 (IMHO) if your racer organization so allows.
> Jack
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