Upgrade crankset?

Hi, I have been riding a 2013 Wilier for several years now and I decided to upgrade the transmission this Spring from 105 5700 to Ultegra 6800 because I got some new wheels that have an 11 speed hub.
The bike has a custom painted FSA crank that I really like, but the guy at the shop told me it wouldn't work with the 6800 chain?? He urged me to buy a matching crank, which I did not really want to do. He also told me that my current crank at 170 was too short for my frame (56), and I would need a 172.5. I have never noticed an issue, but I felt like I was being sold a bunch of bullshit.
The bike has a custom painted FSA crank that I really like, but the guy at the shop told me it wouldn't work with the 6800 chain?? He urged me to buy a matching crank, which I did not really want to do. He also told me that my current crank at 170 was too short for my frame (56), and I would need a 172.5. I have never noticed an issue, but I felt like I was being sold a bunch of bullshit.
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Shops, as you might have guessed, make money by selling things, and they'll often thrown in a load of bullshit completely free to encourage you to part with your money.
as for crank length, it is down to personal preference and fit.
was this bike shop Evans by any chance?
De Sisti wrote:
This is one of the silliest threads I've come across.
Recognition at last Matthew, well done!, a justified honour
No, it was machinery row in Madison, WI. They have a good reputation, but this was my first visit to the service shop. Not a good one, I felt hustled. I declined to buy a new crank and bb from them, but he insisted I will have issues down the line because he said the 11-speed chain is thinner and different.
The crank I have is a FSA Goosamer, which from my research I believe is a reputable, reliable and sufficient piece of equipment for what I need it to do.
And yup - your current crankset is fine.
De Sisti wrote:
This is one of the silliest threads I've come across.
Recognition at last Matthew, well done!, a justified honour
Find a new shop. You will never be able to trust the advice you get there.