I bought a cheap 28" steel fork to replace a rusted 26" suspension one on an old Trek MTB for my kid. The geometry looks good, but I can't align the the disc brake caliper properly. The pads end up outside the rotor.
I have a couple of different IS-adapters but none work. To me it seems that this 160 mm rotor can't work with the fork's IS-mount. Should I consider a bigger rotor? Is there a problem with the fork, or could the cheap zoom caliber be the problem? Am I missing something?
Pictured below is what I think would be the optimal position for the caliber. I haven't found an adapter online that would position the caliper as pictured.