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Are those stacks of washers? Are you retarded? Do you want to snap your caliper mount and lock up your wheel, sending you over bars?
Just get an IS mount to post-mount adapter for 180mm rotors.
203mm rotors? Yeah, probably, with picrel, unless the tyre rubs on the caliper.
Why would you though? The wheels are probably already locking up with barely any braking. Also, with 203mm discs you're probably gonna strike and lock up your discs on a curb if your tyre bottoms out, again, sending you over bars.