Is anyone aware of specific problems with Vanmoof cranks/bottom brackets? I have a 2013 Vanmoof 5.1. I had it serviced recently by Vanmoof in Amsterdam and when I got it back, it was riding wonderfully—everything felt smooth and "free", like every little bit of power I was putting into the pedals was getting to the road.

Two weeks later and it's kind of back to where it was before the service. There is a little creaking/ticking sound coming from the cranks every turn and it feels a little like I'm riding through treacle.

Is anyone aware of a specific problem with Vanmoof bottom brackets, or could you suggest what it might be?
I've got the same problem on (what I believe is) a 2013 3.1. I was going to try replacing/upgrading the bottom bracket myself soon, hoping to smooth out the ride.

Unfortunately, I haven't been able to find the size online so I'll need to take it out and inspect before I can order a replacement, hopefully this goes smoothly.

Either way, I'll update with my results when I have them.

Update: Replaced with Suntour 68x118mm Square tapered BB from local (Arlington, MA) bike shop and removed chainguard (personal preference).  Awful sound is gone... For now.

Your mileage may vary. Good luck!