I have a 2010 Hifi 29, which features the active braking pivot. I've noticed on my HiFi, and on a friends Hifi, that the retaining nut for the rear skewer tends to get loose, and I am able to turn it about 1/4 turn or so by hand. I can't unfasten it completely, just the 1/4 turn before it binds again.
Is this supposed to be torqued tight, or does it need to move somewhat in order for the pivot to properly function? If torqued, how much?
Picture attached, with my finger pointing to the nut in question.
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Thread: HiFi - ABP loose?