hi, the lockring came loose on the chainring on my trek marlin8+, wonder if this is common? the lockring says 30nm on it, is that enough? or is it ok to go 35nm maybe?
If the designed limit is 30Nm don't go higher. Any 'nut and bolt' type fastening is basically a spring and you'll remember that elastic limit experiment from school.
That's not to say your torque wrench isn't inaccurate, it might be worth checking with another.
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