Shimano Ultegra 6800...what do I need? I'm gearing up for my first bike tour.  I have an old motobecane cross bike, I think it's a 2007.  I need more granny gears.  Right now I have a 9 speed 12-26.  I'm looking into the Shimano Ultegra 6800 stuff, and so far it seems affordable with great reviews.  My question is, I know I need the cassette, chain, derraileur &amp; shifter.  Anything else?
Shimano 11 speed road cassettes are wider than previous models, so you most likely will need a wider freehub body. In some cases it can be bought separately, but given that you have 9 speed at the moment, I find it unlikely, so add an 11 speed Shimano road rear compatible hub to the purchase list.