"Terry Rudd" <
[email protected]> wrote in message
news:[email protected]...
> Sheldon,
>
> What is the diameter of the locking cassette? I am not certain mine is Dura-Ace but would like to
> know if this guy comes to need it. Thanks in advance Terry (micrometer ready) Rudd
> Sheldon Brown wrote:
I wrote:
The latter is more reasonable, but the hitch is that you still need the special small-diameter
threaded top position sprocket to hold the 6 splined cogs on. These are no longer available.
Jon Isaacs replied
I guess I forgot to add that you need to use a Uniglide cog to lock the thing together. Not just "a"
Uniglide sprocket, it has to be a _Dura-Ace_ Uniglide sprocket. The Dura-Ace Uniglide freehubs used
a smaller thread to make it possible to fit an 11 tooth sprocket.
I forget this because I keep the old cogs and never seem to wear out the small cogs so I figure
everyone has a bunch of em.
Most people wear out the small ones first, especially with Uniglide, where the flat cogs are
reversible, so they wear twice as long! I think I have a BNIB Uniglide 13-24 cassette in with my
parts but I no longer have any bikes with Uniglide freehubs so I guess it probably time to get rid
of it and the rest of my Uniglide cog collection... Uniglide splined sprockets fit just fine on
Hyperglide Freehubs.
Sheldon "Interchangeabilitude" Brown +-------------------------------------------------------+
| Do what you can, with what you have, where you are. | --Theodore Roosevelt |
+-------------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com
Sheldon is correct, as usual. I need the Dura-Ace specific small screw on UG cog. It has an inside ~
32 mm diameter. The diameter is such that the valleys in the casstte body are sligtly larger in
diameter than the diameter of the Dura-Ace UR screw on cog. I have other UG cassette bodies that
accept the larger diameter screw on small cog.
What I need is at least one Dura-Ace specific screw on UG cog to allow me to use my New Old Stock
hub on my old carbon fiber 126 mm O.L.D. frame.
It would be just too easy if Shimano made the 7 speed HG cassette body that I have on my HG-20 hub
interchangeable with my 7 speed UG Dura-Ace hub. David Ornee, Western Springs, IL