On 2017-10-12 07:15, wrote:
On Wednesday, October 11, 2017 at 2:36:03 PM UTC-7, Joerg wrote:
The adapters to increase rotor size in a post-post situation (which
I have front and back) look like this:

http://i.ebayimg.com/images/g/oK8AAO...Au/s-l1600.jpg

My MTB has a factory one from 160 to 180mm up front but I am
considering 203mm. That would make the thing even more extreme,
like this where the screws would look more cattywompus or out of
line than they already do:

https://i.ebayimg.com/images/g/w4MAA...bTa/s-l500.jpg

Why are the spacings so different on both sides while for 160mm
their are not?

Your first adapter is the normal one used on all rear brakes for
cross bikes as far as I know.


My bike has that kind on the front. I'd much prefer the type below
because it would avoid the extremely long screws that are otherwise
needed for a 160mm-native to 203mm-rotor conversion:

https://erpimgs.idealhere.com/ImageF...963c864243.jpg

If they work for 160-203, which the sites that sell them don't really say.


... Putting larger disks on road bikes is
sort of counter-productive since the problem with them already is
excessive power.


It is for a often heavily loaded MTB where I sometimes get to the limits
of the current 180mm & 160mm setup. Where water contacting the front
rotor lets off some hissing.

--
Regards, Joerg

http://www.analogconsultants.com/