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They've possibly not built it with any regard to a set of brakes
They built it with total regard for rim braking I think, then updated the marketing blurb over time as people wanted disc rims. I don't think the rim has changed - they just printed a new sticker with 'disc' on it.
Mavic EX721 26" MTB Rim. Extreme Mountain rim for sidewall rim braking Maxtal alloy is 30% stronger than 6061 without any extra weight SUP rim has a stronger arc-welded joint which is then milled to form an invisible join - eliminating juddering when braking Schrader drilled - but supplied with a rubber grommet for use with Presta valves if required Black anodised finish Weight: 590 grams
miro_o
I'm not doubting anything.
Mavic built a rim for disc brakes. They've possibly not built it with any regard to a set of brakes wearing away at that part of the rim (as they might do with a rim designed for rim brakes) which will of course effect its strength.
Although by the looks of things its overbuilt (as I said) so will be fine.