Good Chinese Casette/Cranks/BB/Chain..?

[hoppala]

Hello there folks,
after being here for several months, this is my first post in this Forum!
i am doing a bike build with ultegra di2 Front and Rear Derailleur + Brakes + Levers which i sniped on the used market for a good price.
for the rest of the build i would like to go Chinese/AliEx.
so my questions:
what would you recommend?
Would you go Chinese or should i use shimano parts for the rest?
If not. Do you know any good BB for BB86?
any Disc Rotors you could recommend?
I was thinking of using the newest Riro Carbon Crank with its Chainring.
Do you know any better options?
are there any good chains for shimano? maybe with flattop also?

Looking forward to replys and thank you in advance!

[gbrnole]

stick with an Ultegra chain. YBN are solid too but for the sake of a few bucks Shimano chains work very well and are pretty bullet proof. for cassettes use ZTTO 3rd Gen or Shimano. ZTTO will be much lighter but an Ultegras cassette is again bullet proof and shifts flawlessly.