Will these work with Shimano Saint M-810...
Will these work with Shimano Saint M-810 Brakes as well? 203mm for from 180mm for rear?
yes. I have the Saint Brakes with these rotors.. I have 203 mm for both front and rear. You will need an adapter for your bike which is very simple to install.
Acop -- which adapter would we need for this?
Amanda Batty - you would need item SHI0108. As for which one, it would depend on the frame brake options. It would be either Post Mount (PM) or International Standard (IS). The best way to describe it would be the Post Mount are threaded into the fork or frame whereas International Standard is not threaded and the bolt would just slide through the fork or frame to thread into the adapter.