Originally Posted by
HillRider
True and even Shimano can't explain WHY those 2x10 chains are limited to double cranks and won't work properly on triples. I've heard reports that they do indeed work with a triple.
Been trying to find the explanation for this myself. My guess would be that the drilled side plates of the newer 10sp Shimano chains may get fatigued from the increased chain angle of a triple and possibly crack. But that is just a guess. Shimano would probably never admit to it if true.