Originally Posted by L Arnold

The 2017 version is a 451 wheel rather than a 406 wheel size (both called 20" but the 451 is bigger).

2017 also comes with a Belt Drive rather than Chain.

Both came have been outfitted with the Front V-Brake and Rear Coaster brake.

I have not had a 2017 in hand yet but I am sure it is a nice bike. Weight should be around 23-24 lbs. That is about 11 kgs.

I did sell a few Mu Uno Shadow that I was able to run down earlier in the year. Customers were very happy.

Belt Drive does change the pricing somewhat. It seems about $250 extra. No Grease, and quiet!
That said, the Mu Uno 2017 is a slick bike. You could change out the hub to multi-speed relatively easy and have an urban rocket ship.

Single speeds are clean and simple and the Mu Uno is a fun little rocket ship.