No, all SR bbs used Ti. The early spindles were hollow Ti, and Campy did have breakage problems. Campy then changed to a solid Ti spindle. Campy stopped manufacturing the SR bb around '81. However, distributors had a large inventory of these many years after production ceased, that is why you still saw them available into the mid/late '80s.
I can't say for sure if Campy used CP Ti in the spindle. I do know that they used 6/4 Ti in all their other Ti pieces within the SR gruppo. So, it seems more likely that 6/4 was used in the spindle as well.
Marc Boral Long Beach, CA
-------Original Message-----
From: Steve Freides Date: Sunday, October 07, 2001 9:34:53 AM To: classicrendezvous@bikelist.org Subject: Re: [CR]Campy SR/NR Spindle Question
Marc Boral wrote:
>
> NR uses a steel spindle and steel cups.
>
> SR uses a titanium spindle and alloy cups. The races on the cups and
> spindle of the SR ti bb are ground to a different radius to accept 3/16"
> bearings, as opposed to the 1/4" bearings used in the NR.
I thought only early SR used a Ti spindle and that they withdrew that after they had breakage problems. I recall hearing the SR Ti spindles were commercially pure (CP) titanium, not the alloys in use nowadays.
=S
> The spindles and cups of the SR are not interchangeable with the NR .
>
> Marc Boral
>
> Long Beach, CA
>
> -------Original Message-------
>
> From: Eric Elman
>
> Date: Sunday, October 07, 2001 5:35:09 AM
>
> To: classicrendezvous@bikelist.org
>
> Subject: [CR]Campy SR/NR Spindle Question
>
> Can someone advise if there is a difference between a post '77 Campagnolo
NR
>
> vs. SR spindle? Is it that only the cups are different and the spindles
are
>
> the same or are they different too? If they're different, how do you tell
>
> them apart? Can I use a NR spindle in SR cups?
>
> Thanks in Advance,
>
> Eric Elman