Originally Posted by
kickstart
The Gazelle Friiik has a full chaincase.
https://www.youtube.com/watch?v=9CJ8wPtZHF8
The difference in weight, and efficiency on hills for a standard IGH compared to a derailleur is actually fairly insignificant in actual practice so I don't really see the advantage of the Friiik, but.........
It's pretty awesome, better than my chain-guard. But then I spent about 50 cents and an afternoon on mine, and it does what I want ....