Bumping this thread. I see that Girodisc has the following items for the OG:
Fronts:
https://www.girodisc.com/Girodisc-Fr...M4_p_6816.html
Rears:
https://www.girodisc.com/Girodisc-Re...M4_p_6846.html
However, I can't find their replacement rings anywhere, despite the description saying:
"Once the Girodisc system is in place, simply replace the cast iron rotor when needed."
Does anyone know if there are F8X-specific replacement rings available?