I don't know, I haven't yet futzed with those. But someone on here bought a Dahon Launch with the 15mm offset and did a post on here, basically "WTF?!" and asked if there were easy solutions, there weren't evidently, because he had his bike-monger swap out the hubs on the wheelset. I had read about the 15mm offset previously on Dahon's website, but having never had a disc bike before, so did not even consider a caliper compatibility issue. Also, the disc a lot closer to the spokes, may not have allowed clearance for other calipers to fit, especially calipers that actively pushed on both sides of the disc. That member's post to ask how to swap calipers was due to terrible performance of the mechanical calipers and pulled one apart and posted photos, and the problems were obvious, a simple mechanism with no seals against contamination, plus piston only extends on one side. IIRC, that member was in an area with almost no rain, but a whole LOT of sand, as far as the eye can see, contamination issues even riding purely on paved road.