It's not even that that MF underrate(or rate at all, how we define "rating") their derailers ..... it's that when they give the spec, they have * specific* cassettes in mind for each. The "rated" specs then, are not meant as hard ruled limitations , but are based on the MF* intended cassettes in mind*. It's a marketing and well, logistical "suggestion" ... lol . That's what I call it. It minimizes confusion for some .... adds to it for others, no doubt. Considering ALL the parts made ... ALL the vendors .... ALL the bike shops and manufacturers .... it's an attempt to make some sort of standard that everyone can understand, or at least use a base from which to work from for others.
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