Wayne Bingham wrote:
> EDCO's Eccentric BB had steel cups, not alloy. This BB's primary limitation
> is that it requires 35mm clear to slide the unit in. On a damaged BB
> shells, that's not much of a problem because the threads are of little
> concern, but on non-damaged BB shells there are often "interference" issues.
> I've tried the EDCO Eccentric in a number of BB shells, and there have been
> only a few where it slides right in. Haven't yet really figured out what
> the mitigating factors are, but interestingly, one will slip right into the
> BB shell on an ALAN Record frame I have here in the shop.
Is the ALAN Italian thread? That would give a little more clearance. That said, I haven't run into that problem here. I just dug up my old "Grip" unit and managed to slide it into 3 BB shells: Takahashi, Cinelli, and Henry James (all English thread) without trouble.
But if you refer to the cup close-up on VeloBase
(http://www.velobase.com/CompImages/BottomBrackets/DDA8D70F-6245-4A51-B8B9-315958CE9F87.jpeg),
you can see that the inside of the cup is stamped "BSA". Perhaps the
eccentric cups were available in different diameters to accommodate
different shell diameters?
>
> There has been little if any discussion here on another "fix" for damaged BB
> shells. Campagnolo made "oversized" BB cups for it's Record and similar
> BBs, in all threadings. For example, the English "OS" fixed cup is 1.390x24
> TPI, vs. the normal 1.370x24 TPI. The "OS" cups used the same internal
> parts as the non-OS cups. However, I can't recall ever seeing "oversized"
> taps. VAR catalogs don't list them. Did Campy make them? Were the OS cups
> made to just be driven in to damaged BB shells? Was this, indeed, a fix for
> damaged BB shells, or was there some other purpose?
>
> Wayne
--
-John Thompson (john@os2.dhs.org)
Appleton WI USA