robert nanzig wrote:
scary story snipped...
> Now the questions. Has this ever happened to anyone? What material
> is the knockoff made of-softer than the hub? Could the fact that I did
> not lubricate the threads after completely cleaning them this spring
> have contrbuted to excessive wear-or my participation in the autocross
> at SUNI? What about the other 3 wheels? What would you do?
>
> Rob Nanzig
> 67SV Bolt ons are looking pretty good right about now!
Rob, First of all, glad to hear that you were not hurt.
Yes, the knockoff is made of a softer and less strong material, mine looks
to be chrome plated brass. The hub is a steel piece. I have never heard
of the threads shearing. maybe someone else has. Although I can imagine
shock loads causing the thread to shear, it is hard to see hard cornering
forces being sufficient to do this.
Are the wire wheels original - allowing full thread engagement? My
knockoffs have about 3/4 inch thread engagement.
Lubricating the threads provides two benefits: reducing potential corrosion
and allowing proper torquing of the knockoffs. Without the lubrication one
is more likely to think that the knockoff is fully tight before it has been
adequately tightened. If this where the case and the wheel was loose on
the hub, then this may have caused or contributed to the thread failure.
One other thought, if the threads had been buggered up in the past (such as
having been cross threaded) then there may have not been sufficient thread
strength to retain the knockoff.
In any case a carefull examination of the remaining wheels is in order. If
it where me I would look for: the thread shape on the hub, the thread shape
on the knockoff, ensure that the knockoff has sufficient thread engagement
and that the knockoffs are tight.
Thanks for the heads up and glad to hear that you escaped injury.
-Roger
This archive was generated by hypermail 2b30 : Tue Sep 05 2000 - 10:55:44 CDT