In an impulsive moment, I bought a used Power2Max FSA crankset cheap. It came yesterday and realized that it's a 10 speed setup as in marked "10 Speed Only." Luckily, I've been told that P2M is very helpful, support-wise, so I'm going to contact them as I only have 11 speed on my bikes, even my trike.

I'm really bad about reading the fine print in "for sale" ads.