A while ago, I was looking into using a 298 mm disc with the stock RD350 caliper and a RD400 slider (to get the caliper behind the fork) What I found was that a caliper adapter would be quite large and triangular in shape, so I shelved that idea for a while.
That 298 mm disc was an XS650 disc hub that I refurbished, with a custom ordered disc from ISR in Sweden. Sort of a "sleeper setup", but the necessary caliper adapter would stand out too much for my taste.
That 298 mm disc was an XS650 disc hub that I refurbished, with a custom ordered disc from ISR in Sweden. Sort of a "sleeper setup", but the necessary caliper adapter would stand out too much for my taste.