i'm rolling with the 200 mm front&rear and i'm very impressed.
from what i know there is no brake adapter for 203 mm made by formula (neither 203 mm discs). you'll have to use adapters & rotors from other manufacturers for the 203mm format.
you can try with the 220mm rotor & adapter from Formula.
they have 220, 200, 180 & 160 mm rotors as I know, and they're among the lightest out there.
FWIW I'm running 200 front and 180 back. I started on 200 both (ordering mistake) but found the back too powerful, plus I'm all for saving weight, so was happy to go down a size.
i run 200mm front and rear, but on the K18.. i weigh 210lbs.
when the brake is set up right, I have more than enough juice to stop myself
The One is a much more powerful brake, so (depending on how much you weigh) you should be able to run 200 front/180 rear without much trouble. It would save some weight, and offer plenty of power.
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