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Join Date: Apr 2009
Location: Boulder County, CO
Posts: 1,511
Bikes: '92 22" Cannondale M2000, '92 Cannondale R1000 Tandem, another modern Canndondale tandem, Two Holy Grail '86 Cannondale ST800s 27" (68.5cm) Touring bike w/Superbe Pro components and Phil Wood hubs. A bunch of other 27" ST frames & bikes.
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You are saying that the spacing positioning the rings on triple cranks has gone unchanged from a 6/7/8 crank to 9, and now 10? That the cranks all position the center of the rings exactly the same distance apart? I'm not sure that's entirely true.
With chains getting narrower in profile things would have needed to keep proportional wouldn't they? If the chain was reduced in width 10% would they really have kept the c-c distance between the rings the same throw?