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What frame had chain guide/idler as derailleur?

454 Views 1 Reply 2 Participants Last post by  brant
There was a frame shown a couple of years ago that had a proprietary idler/chain guide that articulated and acted as a front derailleur. I believe it was a high pivot and the top idler moved in and out to switch the front ring position. I haven't seen it again and can't recall the maker.

Does anybody remember this?
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