How long should a brake disc last?
It is impossible to put a definite life on a brake disc of any sort, there are too many variables that can have a dramatic effect on the life of a brake disc, but it should be noted that a ductile iron disc will last approximately 50% longer than a stainless steel disc if used to generate the same level of performance. However, as ductile iron discs offer higher levels of friction, it is almost always the case that the rider will make use of this and reduce the life of the disc to that of a stainless steel disc. So whatever your riding style, a ductile iron disc will offer advantages; either longer disc (and pad) life, improved performance, or a combination of these two benefits.
