One can do this to adjust the chain tension without an eccentric BB.
Jim Merz Big Sur CA
On Mon, Jan 10, 2011 at 10:36 AM, Peter Brueggeman <
4peebee@peterbrueggeman.com> wrote:
> In Dale's GP Wilson photos, there's a tandem photo showing an unattached
> chainring in the tandem chainline located between the captain and stoker
> chainrings. That's a new one to me. It looks like it is a couple of teeth
> larger than the front and rear chainrings.
>
> Is this something others have seen done, and does it accomplish anything
> other than looks?
>
> http://www.flickr.com/
> ..........
> Peter Brueggeman
> La Jolla California USA
> 4peebee(at)peterbrueggeman.com