Dura Ace BB Spindles?

Mike S.' mikeshaw2@coxDOTnet said:

Hey, been having a bit of a problem with two Dura Ace BB spindles. Seems that the races that the
balls ride on loosen up for no apparent reason.

I warrantied one spindle, got the replacement, installed it, and within a few weeks, it had done it
again. I've done loose ball BBs lots and lots of times, so it isn't "mechanic error."

Anyone else have a problem like this?

The cones on which the balls of 7700 bottom brackets orbit are intentionally designed to fit on the
spindle loosely enough to allow replacement. Although they fit on the spindle with very close
tolerances, it's not a press fit and can therefore be slipped on and off by hand. The _flaw_ you're
describing is actually a _feature_.

See the exploded diagram of 7700 bottom brackets at
shimano-europe.comBB 7700.pdfOpen ↗

The cones are Shimano part number Y-1TG07000.

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mikeshaw-<< Hey, been having a bit of a problem with two Dura Ace BB spindles. Seems that the races
that the balls ride on loosen up for no apparent reason.

Spline DA BB spindles? The races are loose and can be replaced.

<< Anyone else have a problem like this?

Again, not a problem, the things come off easily.

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