Dear Carl,
This is an odd nut, being thin. There aren't a lot of threads to support high torque. It also has stress risers at the stamped text. I've had two of them split, and both at the text. They didn't split when I tightened, they split while on the bike and riding. if these are Nouvo Record or Super Record hubs, keep in mind these parts are old and can be fatigued.
I think the torque one can apply with a Campy two-ended cone wrench without injuring your hand is a representative upper limit. The function of the nut is to jam the threaded cone so it does not turn due to ball friction, and to ensure that it maintains the proper position when the QR skewer is locked. The bearing is set a skoche loose (no, I do not have an end-play spec to quantify "skoche"), in the hope that it pulls up to just touching when the skewer compresses the frame ends and hence the cone/axle subsystem. We're making the skewer (a stiff spring) compress the axle (a stiffer spring, 'cuz it has more cross-section).
I also think the multiple cone-wrench method is the best way to go, because cones don't always stay where they should when you tighten a lock-nut. Setting cone bearings can involve some art, or at least skill.
Ken Freeman
Ann Arbor, MI USA
> I too, have never heard of exacting tighening specifications, but I think its a
\r?\n> question worth asking because I have heard varying instruction on the subject,
\r?\n> and Ihave dissasembled Campagnolo where the installer (other than the factory),
\r?\n> have obviously not tightened correctly, i/e/brinelling, or bearing overloading.
\r?\n>
\r?\n> Thanks BOB, and all who reply,
\r?\n>
\r?\n> Carl Kamenzind
\r?\n> West Seattle WA USA
\r?\n>
\r?\n> Bob Freitas wrote:
\r?\n> specs are based in fastener size, you could probably Google for them
\r?\n>
\r?\n> BOB
\r?\n>
\r?\n>
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