I have 183/160 on the hardtail, 183/183 on the full-sus. Started out with a 160 rear on the full-sus but it felt a bit underpowered with the grip the rear tyre had compared to on the hardtail.
There’s plenty of heavier riders than me so I can see why they’d be using 200+ rotors – look at the size of the brakes on a Bentley or Rolls. 1/2mv^2 and all that…
I like max braking with min effort so it’s 203/180 for me. It’d be 203 both ends but the 180 is all I had spare when I built it up. It is a 180/170mm bike right enough.
Big rotors are great for some bonkers trails that require late hard braking
