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Okay thanks, that makes sense and is useful to know.
In your experience of pompetamine ownership, have you found an adaptor that works better? Installing it the other way around, as I've now done, allows the caliper to sit better with respect to the chainstay however it's only going to grab the rotor with about half of the pads, which isn't ideal. Perhaps a 140 adaptor with the 160mm disc in this configuration will work better?
Cupcakes
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Not backwards, just not optimised for that dropout. When designing a general purpose adapter, the designer has to make it fit as many common cases as possible, and that means predominantly IS mounts which are above the dropout rather than inside the rear triangle. The safe choice is to rotate the caliper position backwards around the axle centre so that the front of caliper will always clear the seatstay even on bikes with bulky Horst-link pivots in that area.