Originally Posted by Old Hammer Boy
On my triple (Ultegra 9-speed), I can run all but 1 or two cogs on either the smallest or largest chain rings. Not that I cross chain like that when riding, but when I tune up the FD, those are the limits. On the middle ring, I can run all 9 cogs without rubbing.... OHB
Same with my 105/Tiagra setup.
Running Big/Big or Small/Small is not a good idea anyways, so any triple will have gear combinations that will never be used.