Joined: Feb 2012
Posts: 19,362
Likes: 5,503
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
As ft der cages became more and more sculpted to shift better the gap between the outer ring and the backside of the RH arm also grew. This increased the "Q" factor (sometimes called "tread") and some riders (like me) are sensitive to how wide apart their feet are when pedaling. So some cranksets are reducing this gap to lessen the Q. Matching a deeply sculpted cage with a narrow gap and you get the chance top rub or really tight clearances.
With out a visual that's all I got. Andy
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AndrewRStewart