If you - sorry, "he" - remove the IS to Post adapter, you can mount the brake directly to post mount forks. Leave the washers in place, but use a 20mm smaller rotor...
Pretty much all calipers are PM but forks are either PM or IS. The adaptor also has to be the right size for the rotor
[i] but use a 20mm smaller rotor[/i]
unless the PM mounts on the fork are set for a 180mm rotor, not the 160mm IS standard.
Ah, okay, so if [b]he[/b] wants to use the same (160mm) rotor, then he'll need to buy an adaptor?
{edit} of course, the rotor on the picture is 180mm, so 160mm would be 20mm less than that, so it would work. He really is a bit of a thicko, ahem.
unless the PM mounts on the fork are set for a 180mm rotor, not the 160mm IS standard.
Be a bloody stupid fork manufacturer who mandated a 180mm minimum rotor but yes, your point is valid
He really is a bit of a thicko, ahem.
Yes, well, give him a slap then and tell him he owes me a pint 😉

