RE: [CR]RE:Was: W Cut Tooth Mechanism/Now: Move to proprietary drivetrains?

(Example: Framebuilding:Restoration)

In-Reply-To: <20060810142956.33938.qmail@web52508.mail.yahoo.com>
From: "R.S. Broderick" <rsb000@hotmail.com>
To: classicrendezvous@bikelist.org
Subject: RE: [CR]RE:Was: W Cut Tooth Mechanism/Now: Move to proprietary drivetrains?
Date: Thu, 10 Aug 2006 10:30:10 -0500


Don,

"W" cut outer chain rings can be used without limitation or regard to other drive train components (...with the exception of the obvious here - BCD, derailleur capacities, etc.). Super "W" cut chain rings, however, supposedly required an application specific front derailleur. And while I was never much into the BMX scene, I strongly suspect that one might well be able to employ any generic front derailleur intended for use with a triple crank in conjunction with a Super "W" cut outer ring.

Shimano's insidious proprietary drive train concept (...hey, now you gotta buy all Shimano or else we cannot guarantee it will work properly and most certainly will not honor warranty claims resulting from the use of "non-standard" product in violation of our explicit installation instructions) was fueled more by SIS and their freehub concept than anything else (...other than their marketing department, of course). But the truth of the matter is that you can actually mix an match many of those "off topic" components with various parts from other manufacturers as well as pieces that pre-date SIS - but you have to know just what you are doing in this regard in order to make things work properly (...it is really not "black magic" though, more common sense and a solid understanding of fundamental mechanics).

Robert "that's three for the day, so good-night all" Broderick ...the "Frozen Flatlands" of South Dakota

-----------------------------------------------------------------------------
>From: Don Wilson <dcwilson3@yahoo.com>
>To: Classic Rendezvous <classicrendezvous@bikelist.org>
>Subject: [CR]RE:Was: W Cut Tooth Mechanism/Now: Move to proprietary
>drivetrains?
>Date: Thu, 10 Aug 2006 07:29:56 -0700 (PDT)
>
>Could the W Cut in any way limit a bicyclist's ability
>to mix and match chain rings and derailleurs from
>different manufacturers; i.e., was it part of an
>attempt to create proprietary drive trains? Or was it
>solely an attempt to improve the breed?
>
>Don Wilson
>Los Olivos, CA USA
>
>--- "R.S. Broderick" <rsb000@hotmail.com> wrote:
>
> > Don,
> >
> > I do not feel qualified to comment on the current
> > market status and
> > collectibility factor of this particular
> > Specialized. That said, it should
> > be noted that there are some gross misstatements of
> > fact made within the
> > auction listing text itself although these are
> > likely begot of ignorance in
> > conjunction with a desire by the commercial reseller
> > to over hype the
> > relative value of this bike rather than being the
> > result of any malicious
> > intent.
> >
> > However, your second question provides a perfect
> > opportunity to underscore
> > the potential value of having at least a few of the
> > earlier Shimano catalogs
> > currently available for public scrutiny inasmuch as
> > one now has a few more
> > tools at their disposal should they care to take the
> > initiative to do a bit
> > of research on their own.
> >
> > The "W" cut tooth mechanism actually predates the
> > full blown Shimano Aero
> > Dynamics concept and was available on both Dura-Ace
> > EX and 600 EX series
> > chain rings (...with a further Super "W" cut version
> > requiring a specialized
> > front derailleur being intended for BMX
> > applications). Basically, Shimano
> > shortened the height of two adjacent teeth at two
> > very specific points on
> > their outer chain rings in an effort to optimize
> > shifting one's chain from
> > said ring onto the smaller chain ring. The
> > principle here being that under
> > heavy load conditions such as when one is standing
> > on their pedals out of
> > the saddle while climbing, the modified chain ring
> > tooth profile at specific
> > shift points reduces the amount of stress inflicted
> > on the outer chain ring,
> > the chain itself, and the front derailleur to the
> > extent that less effort is
> > required to lift the chain from the big ring in
> > order to drop it onto your
> > smaller chain ring, thereby facilitating smoother
> > shifting under these
> > conditions.
> >
> > You can read all about it using the following
> > convenient links:
> >
> >
>http://www.wooljersey.com/gallery/main.php?g2_itemId=158973
> >
> >
>http://www.wooljersey.com/gallery/main.php?g2_itemId=142855
> >
> >
>http://www.wooljersey.com/gallery/main.php?g2_itemId=142873
> >
> > Robert "somewhat Shima-Know, ya know" Broderick
> > ...the "Frozen Flatlands" of South Dakota
> >
> >
>-----------------------------------------------------------------------------------
> >
> > >From: Don Wilson <dcwilson3@yahoo.com>
> > >To: Classic Rendezvous
> > <classicrendezvous@bikelist.org>
> > >Subject: [CR]Ebay Specialized Aero Prototype
> > >Date: Wed, 9 Aug 2006 23:03:26 -0700 (PDT)
> > >
> > >Aero. Collectibility ramping up?
> > >What does "WCut" stand for on chain ring?
> > >280014555729
> > >Don Wilson
> > >Los Olivos, CA USA
> > >
> >
> >
> > _______________________________________________
> > Classicrendezvous mailing list
> > Classicrendezvous@bikelist.org
> >
>http://www.bikelist.org/mailman/listinfo/classicrendezvous
> >
>
>
>D.C. Wilson dcwilson3@yahoo.com
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