11 speed Ultegra on 10 speed bike?

plymouthsteve
plymouthsteve Posts: 142
edited September 2013 in Road buying advice
I think I've decided to keep my current bike and just upgrade the groupset.
I'm looking at Ultegra which can be bought for 550-600, but about another £50 buys the 2014 6800 11 speed group.
But, do I need a different rear wheel or hub to accommodate the extra gear?

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