Originally Posted by
kenshireen
My daughter is building a bike from scratch.
I think she is getting a bit anal.
First she sprayed the inside of her frame with fogging oil to help prevent rust/corrosion.
She sounds sensible, not anal.
She was than tightening the cassette onto the hub.. I told her to just use the lock ring tool and tighten by hand.
She insists on using a torque wrench.
Is this really necessary? and if so what should it be calibrated at.
I have never used a torque wrench to change cassettes
40Nm is a lot of torque, so it's easy to under-torque a cassette when tightening by hand. This matters if you're using an aluminum freehub, as under-tightening the cassette lockring will lead to worse scoring of the cassette. Otherwise, I would say it's not super critical.