Post mounts

PB Forum :: Whyte Bikes
Post mounts
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Posted: Jan 16, 2020 at 12:45 Quote
Hi all changing my rotors from 180 to 203 is it just a case of changing the post mount from 180 to 203

Posted: May 12, 2020 at 1:46 Quote
If your caliper is fitted directly onto post mount of forks with the 180mm rotor (without an adapter) that means your forks are 180mm 'native' post mount, i.e:- the smallest rotor you could fit, you will need a +23mm adapter:- Shimano
SM-MA-F203P/PM Front (180mm) to 203mm.

If the caliper already has an adaptor with the 180mm rotor then you would need to remove existing +20mm adapter and replace with this one:-
I-SMMAF203PPA which is a +43mm adapter to convert a 160mm post mount fork to fit a 203mm rotor.

Posted: Nov 8, 2020 at 4:01 Quote
Just a note to save other people the pain, the rear is a Flat Mount, not a Post Mount. I couldn't find adapters much cheaper than from the Whyte website:

The third picture down highlights the difference:

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