Re: [CR]Proper Bottom Bracket Width for TA Professional Cranks


Example: Bike Shops
Date: Sun, 20 Apr 2008 19:42:51 -0700 (PDT)
From: "Fred Rednor" <fred_rednor@yahoo.com>
Subject: Re: [CR]Proper Bottom Bracket Width for TA Professional Cranks
To: links0311@yahoo.com, Classicrendezvous@bikelist.org
In-Reply-To: <bf8.2a9985e0.353d13da@aol.com>



--- DTSHIFTER@aol.com wrote:


> Beau Links asked:
>
> > <<have a set of TA Professional cranks from the mid 70s and
> was wondering
> > if anyone knew the proper BB width to use with these
> cranks? I have a 107m
> m BB
> > already and was going to try that. The cranks are a
> double.>>
> >
> The 'correct' TA spindle was 116mm but it should be used with
> TA cups in
> order to be "meaningful" - I know that Sutherland's claims a
> Stronglight BB
> (118mm
> spindle) can be substituted, but I have tried that
> combination, and it does
> not allow for enough clearance of the inner ring and the RH
> chain stay on most
> English frames I played with......As the esteemed Mr. H.
> Sachs would say:
> YMMV

The actual TA spindle for a TA Profesionnel double is the model 344 which, as Chuck Brooks mentioned, is about 116mm total length. But as Chuck also mentioned, these spindles can cause a tight fit - as far as clearance between the inner chainring and the chainstay are concerned - unless your chainstay is crimped/narrowed in the manner of a circa 1960s/1970s French frame.

The next longer TA spindle, the model 373, had a total length of about 120mm. Like most (if not all?) TA spindles, it was asymmetrical - in this case the right side was offset about 6mm with respect to the left side. If your 107mm spindle works (and I'm guessing this is a symmetrical Shimano, Sugino or Tange spindle) it will be a major miracle, in keeping with the Passover and Orthodox Easter season. If it's a Miche 107mm spindle, there is no doubt that only divine intervention will allow the combination to succeed.

Still, you might first try what you have as a guide. But - unless you can get the proper TA spindle (and they do show up on eBay and in the back room of local bike shops) you might have to resort to something like this: Get Shimano UN-53 BBs in 118mm. Try it out, using a 1 or 2mm spacer on the fixed cup side if necessary. If it still doesn't work, move on to the 122mm model

But - as brothers Chuck and Harvey are want to say - Your Mileage May Vary...
     Best regards,
     Fred Rednor - Arlington, Virginia (USA)