Bottom bracket installation problem

On Sun, 20 Jun 2004 21:51:12 +0100, "Qwerty Uiop" <[email hidden]>

Quoted message said:

Dear all, I'm in the process of installing a UN73 bb. The
sealed unit screws in fine but the resin non-drive side cup
won't screw in far enough to be snug against the bb shell
(I've just cracked one whilst trying). Is this a problem or
is it ok to have a thread or two showing? On my other bikes
there's no gap at all. Thanks.

A little bit showing isn't a problem. A lot and you have to
wonder if you are installing a 73mm width into a 68mm shell.
If the chainline is ok and the cranks are pretty
symmetrical, let the threads be exposed.

"Qwerty Uiop" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

Dear all, I'm in the process of installing a UN73 bb. The
sealed unit screws in fine but the resin non-drive side
cup won't screw in far enough to be snug against the bb
shell (I've just cracked one whilst trying). Is this a

I've had the same thing happen on a customer's bike. Unless
the BB feels loose, I wouldn't worry about it too much.

--
Phil, Squid-in-Training

qwerty-<< I'm in the process of installing a UN73 bb. The
sealed unit screws in fine but the resin non-drive side cup
won't screw in far enough to be snug against the bb shell
(I've just cracked one whilst trying). Is this a problem or
is it ok >><BR><BR>

Me thinks you have a BB for a 73mm shell, installing it into
a 68mm shell.

Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St.
Boulder, CO, 80302
(303)440-3535 vecchios.comvecchios.comOpen ↗ "Ruote convenzionali
costruite eccezionalmente bene"

Thanks for your replies, chaps. I've read somewhere that the
cup should be snug against the shell to lessen the chance of
it loosening but, having visited a bike shop where most of
them weren't, I think I'll just ignore it. The unit is
definitely the right size for the shell. Regards.