What are the dimensions of the head tube and headset? Bridgestones of the RBT level had 30.2mm i.d. head tubes. Specialized made their headsets in that size as well as the "Japanese" standard of 30mm. I'd measure those two parts first, see if the headset measures small. Head tubes don't often enlarge without a crash happening.
David Feldman
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>From: Ray Stedronsky <ray@dcn.davis.ca.us>
>To: Classic Rendezvous <classicrendezvous@bikelist.org>
>Subject: [CR]Head tube question
>Date: Thu, Dec 14, 2000, 5:16 AM
>
> For all you frame builders out there, a question.
> I have a 92 RB-T that has been both my winter commute bike (with
>lights and fenders) and my summer mountain bike (with cyclocross tires and
>suspension stem) for the past 4 years.
>
>Today, I noticed that the lower headset bearing race was loose inthe frame.
>It was an aluminium Specialized set and I thought the perhaps thesoft alloy
>had worn or become ovalized from the stress of off road riding. I
>substitued a steel Specialized headsetthat I had around and thelower bearing
>cup was a better fit but it still went into the frame withpressure from my
>hand alone. It was a difficult push but it still did notneed a press to
>install. I suspect now that maybe my lower lug has become ovalized or just
>gotten larger than spec. due to age and a hard life.
>
> My question:
>
> Is there a way to repair this short of removing the lower lug with a
>torch and brazing a new one onto the frame. Shims? Epoxy? External set
>screws?
>
> I'm open for suggestions
>
> Thanks in advance,
> Ray Stedronsky
> Davis, California (where it's a "soft" day in the valley according to my
>ex-brit neighbor)