On 2017-10-11 18:10, Ralph Barone wrote:
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?


Probably because the axis along which the brake gets extended is not
perpendicular to the outer surface of the disk, so as you slide the caliber
outwards, you have to rotate it a bit to keep it tangential to the outer
surface of the disk.


I wonder if that's critical for round pads. The 160-180mm that was
factory installed up front is angled but the calipers look like it
wouldn't have mattered.

--
Regards, Joerg

http://www.analogconsultants.com/