di2 11 speed upgrade - new crankset?

rheady30 Posts: 2
edited May 2015 in Workshop

I am in the process of upgrading my 6770 di2 components to the new 11 speed 6870 versions. The main reason being the fact that frustratingly, Shimano no longer stock the 10 speed version so if something breaks I'll struggle to find a replacement. That coupled with the fact that I wouldn't be able to simply replace the rear derailleur with the 11 speed version (and keep the 10 speed front derailleur) means I may as well replace the whole lot now...

I have just bought new rear and front derailleurs, a new 11 speed cassette and a new 11 speed chain. I was just wondering whether or not I need to buy a new crank as well? I currently have a 10 speed Ultegra 6700 version. I've read on various websites that this will be compatible with all 11 speed components but I just wanted to make sure.

Thanks for any advice offered