So I pulled the trigger on a 3D520SP chain. At the same time I went with the known JT 15 teeth front sprocket and a JT 42 teeth aluminum rear sprocket.
JT steel 15t, JTF190215RB, 11.61 € ~ 12.80 $: 198 g ~ 0.4365 lbs
JT aluminum 42t, JTA89742BLK, 22.79 € ~ 25.13 $: 239 g ~ 0,5269 lbs
3D520SP...