Originally Posted by
Charles Wahl
Why not get a long-cage 600EX? I see them occasionally on eBay.
I have a long-cage 600 (a BR6207, not necessarily an EX), and it shifts TERRIBLY! That's why not to get one. A Huret Duopar or Ecopar is a far better choice. Even a Campy Rally, and I'd bet a Campy Gran Turismo, would be better choices.
To teh OP: you outline a very odd cluster: 13/17 .... 27. Can you actually make that combination? Stores that can sell you cogs are today few and far between.
Road Fan