Your question depends on the sort of use you're looking to get out of your bike, not to mention it is very important that the pads are paired up with the right kind of discs.
Ductile iron rotors are built for organic pads. Steel rotors are built for sintered pads. While the latter does NOT offer the kind of all-out stopping power of organic pads on ductile iron discs, it DOES offer more than sufficient stopping power over a lower and wider temperature range.
The iron rotor/organic pad combination is advantageous in a racing environment where the brakes are used ferociously and frequently keeping rotor/pad temperatures high where this set up works best.
Regarding noise and disc wear, I can't answer those questions because I don't know - I've never ridden on the iron/organic set up, moreover, if you're braking that hard all the time on the road, you're asking for trouble anyway and you should be at the track in the first place!
The most important thing is that you match the pads to the discs correctly as was mentioned above. Hope this helps!
Asking because I bought a pair of sintered yesterday. On the package it says there are some carbon/kevlar stuff. But it is described for touring / cruising use. Can anyone give more info on carbon/kevlar stuff?
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