Not so much of a Shimano guy, and I have a question about Shimano shifting levers. Do Shimano dual control indexed handlebar levers handle both double and triple cranksets or are there 2 ring and 3 ring specific models? I would be interested in knowing about Dura Ace, Ultegra, and 105 only and I am interested in 8 speed or 9 speed levers. Thank you very much.