Thanks guys, wheels mfg adapters do look plastic, some sort of hard plastic, here is the link:
I’ve got two cranksets in possesion, Ultegra R8000 and FSA Gossamer BB386 (100g heaver than Ultegra).
Currently as is, BB30 can take Ultegra R8000 via Wheels Mfg shims, but I like idea of 30mm crank spinde and wider bearing…
If I fit BB30 FSA adapter (+50g), I can then fit BB386 with nice NTN bearings, which would take either FSA crank or Ultegra via small shims. Too much choice!
Question perhaps, whether to keep it light as is, or make it “stiffer” with unknown gains, if any.
Thanks