Originally Posted by
Eric F
FYI - 40nm is not a critical number for cassette installation. I've always just gone with "pretty tight" without a torque wrench, and have never had a lockring loosen up at all while riding.
Ditto. I don't even own a torque wrench that will go to 40nm.
OP, if you really want to remove the lockring, just put on your chainwhip and use a longer wrench on the cassette removal tool. Leverage is your friend. But I do agree (with other posters) that you're probably good-to-go. But in a few years, when you want to replace the cassette again, just remember that a longer wrench is the key.